Make API documentation into YAML files and autogenerate markdown files

and manpages from those.

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+% API
+
+# Builtins
+
+# Num
+## Num.1_PI
+
+```tomo
+Num.1_PI : Num
+```
+
+The constant $\frac{1}{\pi}$.
+
+## Num.2_PI
+
+```tomo
+Num.2_PI : Num
+```
+
+The constant $2 \times \pi$.
+
+## Num.2_SQRTPI
+
+```tomo
+Num.2_SQRTPI : Num
+```
+
+The constant $2 \times \sqrt{\pi}$.
+
+## Num.E
+
+```tomo
+Num.E : Num
+```
+
+The base of the natural logarithm ($e$).
+
+## Num.INF
+
+```tomo
+Num.INF : Num
+```
+
+Positive infinity.
+
+## Num.LN10
+
+```tomo
+Num.LN10 : Num
+```
+
+The natural logarithm of 10.
+
+## Num.LN2
+
+```tomo
+Num.LN2 : Num
+```
+
+The natural logarithm of 2.
+
+## Num.LOG2E
+
+```tomo
+Num.LOG2E : Num
+```
+
+The base 2 logarithm of $e$
+
+## Num.PI
+
+```tomo
+Num.PI : Num
+```
+
+Pi ($\pi$).
+
+## Num.PI_2
+
+```tomo
+Num.PI_2 : Num
+```
+
+$\frac{\pi}{2}$
+
+## Num.PI_4
+
+```tomo
+Num.PI_4 : Num
+```
+
+$\frac{\pi}{4}$
+
+## Num.SQRT1_2
+
+```tomo
+Num.SQRT1_2 : Num
+```
+
+$\sqrt{\frac{1}{2}}$
+
+## Num.SQRT2
+
+```tomo
+Num.SQRT2 : Num
+```
+
+$\sqrt{2}$
+
+## Num.TAU
+
+```tomo
+Num.TAU : Num
+```
+
+Tau ($2 \times \pi$)
+
+## Num.abs
+
+```tomo
+Num.abs : func(n: Num -> Num)
+```
+
+Calculates the absolute value of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number whose absolute value is to be computed.  | 
+
+**Return:** The absolute value of `n`.
+
+
+**Example:**
+```tomo
+>> (-3.5).abs()
+= 3.5
+
+```
+## Num.acos
+
+```tomo
+Num.acos : func(x: Num -> Num)
+```
+
+Computes the arc cosine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the arc cosine is to be calculated.  | 
+
+**Return:** The arc cosine of `x` in radians.
+
+
+**Example:**
+```tomo
+>> (0.0).acos() // -> (π/2)
+= 1.5708
+
+```
+## Num.acosh
+
+```tomo
+Num.acosh : func(x: Num -> Num)
+```
+
+Computes the inverse hyperbolic cosine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the inverse hyperbolic cosine is to be calculated.  | 
+
+**Return:** The inverse hyperbolic cosine of `x`.
+
+
+**Example:**
+```tomo
+>> (1.0).acosh()
+= 0
+
+```
+## Num.asin
+
+```tomo
+Num.asin : func(x: Num -> Num)
+```
+
+Computes the arc sine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the arc sine is to be calculated.  | 
+
+**Return:** The arc sine of `x` in radians.
+
+
+**Example:**
+```tomo
+>> (0.5).asin()  // -> (π/6)
+= 0.5236
+
+```
+## Num.asinh
+
+```tomo
+Num.asinh : func(x: Num -> Num)
+```
+
+Computes the inverse hyperbolic sine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the inverse hyperbolic sine is to be calculated.  | 
+
+**Return:** The inverse hyperbolic sine of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).asinh()
+= 0
+
+```
+## Num.atan
+
+```tomo
+Num.atan : func(x: Num -> Num)
+```
+
+Computes the arc tangent of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the arc tangent is to be calculated.  | 
+
+**Return:** The arc tangent of `x` in radians.
+
+
+**Example:**
+```tomo
+>> (1.0).atan() // -> (π/4)
+= 0.7854
+
+```
+## Num.atan2
+
+```tomo
+Num.atan2 : func(x: Num, y: Num -> Num)
+```
+
+Computes the arc tangent of the quotient of two numbers.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The numerator.  | 
+y | `Num` | The denominator.  | 
+
+**Return:** The arc tangent of `x/y` in radians.
+
+
+**Example:**
+```tomo
+>> Num.atan2(1, 1) // -> (π/4)
+= 0.7854
+
+```
+## Num.atanh
+
+```tomo
+Num.atanh : func(x: Num -> Num)
+```
+
+Computes the inverse hyperbolic tangent of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the inverse hyperbolic tangent is to be calculated.  | 
+
+**Return:** The inverse hyperbolic tangent of `x`.
+
+
+**Example:**
+```tomo
+>> (0.5).atanh()
+= 0.5493
+
+```
+## Num.cbrt
+
+```tomo
+Num.cbrt : func(x: Num -> Num)
+```
+
+Computes the cube root of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the cube root is to be calculated.  | 
+
+**Return:** The cube root of `x`.
+
+
+**Example:**
+```tomo
+>> (27.0).cbrt()
+= 3
+
+```
+## Num.ceil
+
+```tomo
+Num.ceil : func(x: Num -> Num)
+```
+
+Rounds a number up to the nearest integer.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to be rounded up.  | 
+
+**Return:** The smallest integer greater than or equal to `x`.
+
+
+**Example:**
+```tomo
+>> (3.2).ceil()
+= 4
+
+```
+## Num.clamped
+
+```tomo
+Num.clamped : func(x: Num, low: Num, high: Num -> Num)
+```
+
+Returns the given number clamped between two values so that it is within that range.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to clamp.  | 
+low | `Num` | The lowest value the result can take.  | 
+high | `Num` | The highest value the result can take.  | 
+
+**Return:** The first argument clamped between the other two arguments.
+
+
+**Example:**
+```tomo
+>> (2.5).clamped(5.5, 10.5)
+= 5.5
+
+```
+## Num.copysign
+
+```tomo
+Num.copysign : func(x: Num, y: Num -> Num)
+```
+
+Copies the sign of one number to another.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number whose magnitude will be copied.  | 
+y | `Num` | The number whose sign will be copied.  | 
+
+**Return:** A number with the magnitude of `x` and the sign of `y`.
+
+
+**Example:**
+```tomo
+>> (3.0).copysign(-1)
+= -3
+
+```
+## Num.cos
+
+```tomo
+Num.cos : func(x: Num -> Num)
+```
+
+Computes the cosine of a number (angle in radians).
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The angle in radians.  | 
+
+**Return:** The cosine of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).cos()
+= 1
+
+```
+## Num.cosh
+
+```tomo
+Num.cosh : func(x: Num -> Num)
+```
+
+Computes the hyperbolic cosine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the hyperbolic cosine is to be calculated.  | 
+
+**Return:** The hyperbolic cosine of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).cosh()
+= 1
+
+```
+## Num.erf
+
+```tomo
+Num.erf : func(x: Num -> Num)
+```
+
+Computes the error function of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the error function is to be calculated.  | 
+
+**Return:** The error function of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).erf()
+= 0
+
+```
+## Num.erfc
+
+```tomo
+Num.erfc : func(x: Num -> Num)
+```
+
+Computes the complementary error function of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the complementary error function is to be calculated.  | 
+
+**Return:** The complementary error function of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).erfc()
+= 1
+
+```
+## Num.exp
+
+```tomo
+Num.exp : func(x: Num -> Num)
+```
+
+Computes the exponential function $e^x$ for a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The exponent.  | 
+
+**Return:** The value of $e^x$.
+
+
+**Example:**
+```tomo
+>> (1.0).exp()
+= 2.7183
+
+```
+## Num.exp2
+
+```tomo
+Num.exp2 : func(x: Num -> Num)
+```
+
+Computes $2^x$ for a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The exponent.  | 
+
+**Return:** The value of $2^x$.
+
+
+**Example:**
+```tomo
+>> (3.0).exp2()
+= 8
+
+```
+## Num.expm1
+
+```tomo
+Num.expm1 : func(x: Num -> Num)
+```
+
+Computes $e^x - 1$ for a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The exponent.  | 
+
+**Return:** The value of $e^x - 1$.
+
+
+**Example:**
+```tomo
+>> (1.0).expm1()
+= 1.7183
+
+```
+## Num.fdim
+
+```tomo
+Num.fdim : func(x: Num, y: Num -> Num)
+```
+
+Computes the positive difference between two numbers.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The first number.  | 
+y | `Num` | The second number.  | 
+
+**Return:** The positive difference $\max(0, x - y)$.
+
+
+**Example:**
+```tomo
+fd
+
+>> (5.0).fdim(3)
+= 2
+
+```
+## Num.floor
+
+```tomo
+Num.floor : func(x: Num -> Num)
+```
+
+Rounds a number down to the nearest integer.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to be rounded down.  | 
+
+**Return:** The largest integer less than or equal to `x`.
+
+
+**Example:**
+```tomo
+>> (3.7).floor()
+= 3
+
+```
+## Num.format
+
+```tomo
+Num.format : func(n: Num, precision: Int = 0 -> Text)
+```
+
+Formats a number as a text with a specified precision.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number to be formatted.  | 
+precision | `Int` | The number of decimal places. Default is `0`.  | **Default:** `0`
+
+**Return:** A text representation of the number with the specified precision.
+
+
+**Example:**
+```tomo
+>> (3.14159).format(precision=2)
+= "3.14"
+
+```
+## Num.hypot
+
+```tomo
+Num.hypot : func(x: Num, y: Num -> Num)
+```
+
+Computes the Euclidean norm, $\sqrt{x^2 + y^2}$, of two numbers.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The first number.  | 
+y | `Num` | The second number.  | 
+
+**Return:** The Euclidean norm of `x` and `y`.
+
+
+**Example:**
+```tomo
+>> Num.hypot(3, 4)
+= 5
+
+```
+## Num.is_between
+
+```tomo
+Num.is_between : func(x: Num, low: Num, high: Num -> Bool)
+```
+
+Determines if a number is between two numbers (inclusive).
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The integer to be checked.  | 
+low | `Num` | The lower bound to check (inclusive).  | 
+high | `Num` | The upper bound to check (inclusive).  | 
+
+**Return:** `yes` if `low <= x and x <= high`, otherwise `no`
+
+
+**Example:**
+```tomo
+>> (7.5).is_between(1, 10)
+= yes
+>> (7.5).is_between(100, 200)
+= no
+>> (7.5).is_between(1, 7.5)
+= yes
+
+```
+## Num.isfinite
+
+```tomo
+Num.isfinite : func(n: Num -> Bool)
+```
+
+Checks if a number is finite.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number to be checked.  | 
+
+**Return:** `yes` if `n` is finite, `no` otherwise.
+
+
+**Example:**
+```tomo
+>> (1.0).isfinite()
+= yes
+>> Num.INF.isfinite()
+= no
+
+```
+## Num.isinf
+
+```tomo
+Num.isinf : func(n: Num -> Bool)
+```
+
+Checks if a number is infinite.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number to be checked.  | 
+
+**Return:** `yes` if `n` is infinite, `no` otherwise.
+
+
+**Example:**
+```tomo
+>> Num.INF.isinf()
+= yes
+>> (1.0).isinf()
+= no
+
+```
+## Num.j0
+
+```tomo
+Num.j0 : func(x: Num -> Num)
+```
+
+Computes the Bessel function of the first kind of order 0.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the Bessel function is to be calculated.  | 
+
+**Return:** The Bessel function of the first kind of order 0 of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).j0()
+= 1
+
+```
+## Num.j1
+
+```tomo
+Num.j1 : func(x: Num -> Num)
+```
+
+Computes the Bessel function of the first kind of order 1.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the Bessel function is to be calculated.  | 
+
+**Return:** The Bessel function of the first kind of order 1 of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).j1()
+= 0
+
+```
+## Num.log
+
+```tomo
+Num.log : func(x: Num -> Num)
+```
+
+Computes the natural logarithm (base $e$) of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the natural logarithm is to be calculated.  | 
+
+**Return:** The natural logarithm of `x`.
+
+
+**Example:**
+```tomo
+>> Num.E.log()
+= 1
+
+```
+## Num.log10
+
+```tomo
+Num.log10 : func(x: Num -> Num)
+```
+
+Computes the base-10 logarithm of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the base-10 logarithm is to be calculated.  | 
+
+**Return:** The base-10 logarithm of `x`.
+
+
+**Example:**
+```tomo
+>> (100.0).log10()
+= 2
+
+```
+## Num.log1p
+
+```tomo
+Num.log1p : func(x: Num -> Num)
+```
+
+Computes $\log(1 + x)$ for a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which $\log(1 + x)$ is to be calculated.  | 
+
+**Return:** The value of $\log(1 + x)$.
+
+
+**Example:**
+```tomo
+>> (1.0).log1p()
+= 0.6931
+
+```
+## Num.log2
+
+```tomo
+Num.log2 : func(x: Num -> Num)
+```
+
+Computes the base-2 logarithm of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the base-2 logarithm is to be calculated.  | 
+
+**Return:** The base-2 logarithm of `x`.
+
+
+**Example:**
+```tomo
+>> (8.0).log2()
+= 3
+
+```
+## Num.logb
+
+```tomo
+Num.logb : func(x: Num -> Num)
+```
+
+Computes the binary exponent (base-2 logarithm) of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the binary exponent is to be calculated.  | 
+
+**Return:** The binary exponent of `x`.
+
+
+**Example:**
+```tomo
+>> (8.0).logb()
+= 3
+
+```
+## Num.mix
+
+```tomo
+Num.mix : func(amount: Num, x: Num, y: Num -> Num)
+```
+
+Interpolates between two numbers based on a given amount.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+amount | `Num` | The interpolation factor (between `0` and `1`).  | 
+x | `Num` | The starting number.  | 
+y | `Num` | The ending number.  | 
+
+**Return:** The interpolated number between `x` and `y` based on `amount`.
+
+
+**Example:**
+```tomo
+>> (0.5).mix(10, 20)
+= 15
+>> (0.25).mix(10, 20)
+= 12.5
+
+```
+## Num.near
+
+```tomo
+Num.near : func(x: Num, y: Num, ratio: Num = 1e-9, min_epsilon: Num = 1e-9 -> Bool)
+```
+
+Checks if two numbers are approximately equal within specified tolerances. If two numbers are within an absolute difference or the ratio between the two is small enough, they are considered near each other.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The first number.  | 
+y | `Num` | The second number.  | 
+ratio | `Num` | The relative tolerance. Default is `1e-9`.  | **Default:** `1e-9`
+min_epsilon | `Num` | The absolute tolerance. Default is `1e-9`.  | **Default:** `1e-9`
+
+**Return:** `yes` if `x` and `y` are approximately equal within the specified tolerances, `no` otherwise.
+
+
+**Example:**
+```tomo
+>> (1.0).near(1.000000001)
+= yes
+
+>> (100.0).near(110, ratio=0.1)
+= yes
+
+>> (5.0).near(5.1, min_epsilon=0.1)
+= yes
+
+```
+## Num.nextafter
+
+```tomo
+Num.nextafter : func(x: Num, y: Num -> Num)
+```
+
+Computes the next representable value after a given number towards a specified direction.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The starting number.  | 
+y | `Num` | The direction towards which to find the next representable value.  | 
+
+**Return:** The next representable value after `x` in the direction of `y`.
+
+
+**Example:**
+```tomo
+>> (1.0).nextafter(1.1)
+= 1.0000000000000002
+
+```
+## Num.parse
+
+```tomo
+Num.parse : func(text: Text -> Num?)
+```
+
+Converts a text representation of a number into a floating-point number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+text | `Text` | The text containing the number.  | 
+
+**Return:** The number represented by the text or `none` if the entire text can't be parsed as a number.
+
+
+**Example:**
+```tomo
+>> Num.parse("3.14")
+= 3.14
+>> Num.parse("1e3")
+= 1000
+
+```
+## Num.percent
+
+```tomo
+Num.percent : func(n: Num, precision: Int = 0 -> Text)
+```
+
+Convert a number into a percentage text with a percent sign.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number to be converted to a percent.  | 
+precision | `Int` | The number of decimal places. Default is `0`.  | **Default:** `0`
+
+**Return:** A text representation of the number as a percentage with a percent sign.
+
+
+**Example:**
+```tomo
+>> (0.5).percent()
+= "50%"
+>> (1./3.).percent(2)
+= "33.33%"
+
+```
+## Num.rint
+
+```tomo
+Num.rint : func(x: Num -> Num)
+```
+
+Rounds a number to the nearest integer, with ties rounded to the nearest even integer.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to be rounded.  | 
+
+**Return:** The nearest integer value of `x`.
+
+
+**Example:**
+```tomo
+>> (3.5).rint()
+= 4
+>> (2.5).rint()
+= 2
+
+```
+## Num.round
+
+```tomo
+Num.round : func(x: Num -> Num)
+```
+
+Rounds a number to the nearest whole number integer.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to be rounded.  | 
+
+**Return:** The nearest integer value of `x`.
+
+
+**Example:**
+```tomo
+>> (2.3).round()
+= 2
+>> (2.7).round()
+= 3
+
+```
+## Num.scientific
+
+```tomo
+Num.scientific : func(n: Num, precision: Int = 0 -> Text)
+```
+
+Formats a number in scientific notation with a specified precision.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+n | `Num` | The number to be formatted.  | 
+precision | `Int` | The number of decimal places. Default is `0`.  | **Default:** `0`
+
+**Return:** A text representation of the number in scientific notation with the specified precision.
+
+
+**Example:**
+```tomo
+>> (12345.6789).scientific(precision=2)
+= "1.23e+04"
+
+```
+## Num.significand
+
+```tomo
+Num.significand : func(x: Num -> Num)
+```
+
+Extracts the significand (or mantissa) of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number from which to extract the significand.  | 
+
+**Return:** The significand of `x`.
+
+
+**Example:**
+```tomo
+>> (1234.567).significand()
+= 0.1234567
+
+```
+## Num.sin
+
+```tomo
+Num.sin : func(x: Num -> Num)
+```
+
+Computes the sine of a number (angle in radians).
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The angle in radians.  | 
+
+**Return:** The sine of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).sin()
+= 0
+
+```
+## Num.sinh
+
+```tomo
+Num.sinh : func(x: Num -> Num)
+```
+
+Computes the hyperbolic sine of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the hyperbolic sine is to be calculated.  | 
+
+**Return:** The hyperbolic sine of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).sinh()
+= 0
+
+```
+## Num.sqrt
+
+```tomo
+Num.sqrt : func(x: Num -> Num)
+```
+
+Computes the square root of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the square root is to be calculated.  | 
+
+**Return:** The square root of `x`.
+
+
+**Example:**
+```tomo
+>> (16.0).sqrt()
+= 4
+
+```
+## Num.tan
+
+```tomo
+Num.tan : func(x: Num -> Num)
+```
+
+Computes the tangent of a number (angle in radians).
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The angle in radians.  | 
+
+**Return:** The tangent of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).tan()
+= 0
+
+```
+## Num.tanh
+
+```tomo
+Num.tanh : func(x: Num -> Num)
+```
+
+Computes the hyperbolic tangent of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the hyperbolic tangent is to be calculated.  | 
+
+**Return:** The hyperbolic tangent of `x`.
+
+
+**Example:**
+```tomo
+>> (0.0).tanh()
+= 0
+
+```
+## Num.tgamma
+
+```tomo
+Num.tgamma : func(x: Num -> Num)
+```
+
+Computes the gamma function of a number.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the gamma function is to be calculated.  | 
+
+**Return:** The gamma function of `x`.
+
+
+**Example:**
+```tomo
+>> (1.0).tgamma()
+= 1
+
+```
+## Num.trunc
+
+```tomo
+Num.trunc : func(x: Num -> Num)
+```
+
+Truncates a number to the nearest integer towards zero.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number to be truncated.  | 
+
+**Return:** The integer part of `x` towards zero.
+
+
+**Example:**
+```tomo
+>> (3.7).trunc()
+= 3
+>> (-3.7).trunc()
+= -3
+
+```
+## Num.y0
+
+```tomo
+Num.y0 : func(x: Num -> Num)
+```
+
+Computes the Bessel function of the second kind of order 0.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the Bessel function is to be calculated.  | 
+
+**Return:** The Bessel function of the second kind of order 0 of `x`.
+
+
+**Example:**
+```tomo
+>> (1.0).y0()
+= -0.7652
+
+```
+## Num.y1
+
+```tomo
+Num.y1 : func(x: Num -> Num)
+```
+
+Computes the Bessel function of the second kind of order 1.
+
+Argument | Type | Description | Default
+---------|------|-------------|---------
+x | `Num` | The number for which the Bessel function is to be calculated.  | 
+
+**Return:** The Bessel function of the second kind of order 1 of `x`.
+
+
+**Example:**
+```tomo
+>> (1.0).y1()
+= 0.4401
+
+```