1.0.4

What's Changed

• Update to net9.0 by @russcam in #2
• Use AlternateLookup with ReadOnlySpan by @russcam in #3
• Update UnicodeScript to 16.0.0 by @russcam in #4
• Use FrozenDictionary for language models by @russcam in #5

Full Changelog: 1.0.3...1.0.4