// unicode whitespace
// ref: https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt
//
// 0009..000D ; White_Space # Cc [5] <control-0009>..<control-000D>
// 0020 ; White_Space # Zs SPACE
// 0085 ; White_Space # Cc <control-0085>
// 00A0 ; White_Space # Zs NO-BREAK SPACE
// 1680 ; White_Space # Zs OGHAM SPACE MARK
// 2000..200A ; White_Space # Zs [11] EN QUAD..HAIR SPACE
// 2028 ; White_Space # Zl LINE SEPARATOR
// 2029 ; White_Space # Zp PARAGRAPH SEPARATOR
// 202F ; White_Space # Zs NARROW NO-BREAK SPACE
// 205F ; White_Space # Zs MEDIUM MATHEMATICAL SPACE
// 3000 ; White_Space # Zs IDEOGRAPHIC SPACE
// ascii whitespace
// ref: https://infra.spec.whatwg.org/#ascii-whitespace
//
// ASCII whitespace is U+0009 TAB, U+000A LF, U+000C FF, U+000D CR, or U+0020 SPACE.
pub const ASCII_WHITESPACE: = ;