test: add tests for match clause target expression, format other samples

refactor(eval): match type switch style of code throughout binary ope…

…rator logic

optimization: std.slice now mutates one string instead of creating many

Bump CLI version

Oop I forgot to bump the version number in source :/

Version bump

Bump version number -> v0.1.3

Bump version

Fix typo

Fix some closed-channel errors and race conditions in lexer