v2.0.0-Preview2

What's Changed

• Return ImmutableArray<T> by @xin9le in #19
• Add enum member name as UTF-8 byte array by @xin9le in #20
• Micro improvements by @xin9le in #21
• Improve dictionary performance by @xin9le in #22
• Support ReadOnlySpan<char> by @xin9le in #23
• Remove unnecessary attribute by @xin9le in #24
• Rename file / class by @xin9le in #25
• Release : v2.0.0 Preview2 by @xin9le in #26

Full Changelog: v2.0.0-preview1...v2.0.0-preview2