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Casing belongs to the renderers, not the node model, so this is a plain function next to the other syn helpers rather than a newtype in codama-nodes. It exists so a Rust code generator can turn an identifier of any casing into a snake_case one without pulling in heck. Word boundaries: an uppercase run splits before its last letter when a lowercase letter follows, so HTTPServer gives http_server and tokenAMint gives token_a_mint. A digit ends a word only when an uppercase letter follows a lowercase run, so seed2Bump gives seed2_bump while mint_2 and this123 are left alone. That matches heck::ToSnakeCase, checked by differential fuzzing over 1.2 million ASCII inputs with zero mismatches. The only divergence found on non-ASCII input is a word-final Greek capital sigma, which heck lowercases to the final form and this lowercases per character. The function drops non-alphanumeric characters, so the result can be empty or start with a digit. Turning one into a valid Ident is the caller's job and is documented as such.
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Is this something v1 requires right now or could this wait post-v2? |
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