Replace threads with generic mutexed datastructures.

1 files changed, 3 insertions, 3 deletions

diff --git a/docs/optionals.md b/docs/optionals.md
index 56b7ba16..84f886b7 100644
--- a/docs/optionals.md
+++ b/docs/optionals.md
@@ -127,9 +127,9 @@ for line in lines:
 ## Implementation Notes
 
 The implementation of optional types is highly efficient and has no memory
-overhead for pointers, collection types (arrays, sets, tables, channels),
-booleans, texts, enums, nums, or integers (`Int` type only). This is done by
-using carefully chosen values, such as `0` for pointers, `2` for booleans, or a
+overhead for pointers, collection types (arrays, sets, tables), booleans,
+texts, enums, nums, or integers (`Int` type only). This is done by using
+carefully chosen values, such as `0` for pointers, `2` for booleans, or a
 negative length for arrays. However, for fixed-size integers (`Int64`, `Int32`,
 `Int16`, and `Int8`), bytes, and structs, an additional byte is required for
 out-of-band information about whether the value is none or not.