luna-core 2.13.0

Pure-Rust Lua runtime (interpreter only, zero third-party dependencies). The JIT-equipped variant lives in the `luna-jit` crate.
Documentation 
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-- v2.11 CORPUS-II: string case conversion.
print(string.upper("hello"))
print(string.lower("HELLO"))
print(string.upper("Hello, World!"))
print(string.lower("Hello, World!"))
-- non-alpha unchanged
print(string.upper("123abc"))
print(string.lower("ABC123"))