C optimization: single-pass character-to-logical via `ffi_chr_to_lgl` by Copilot · Pull Request #222 · wranglezone/stbl to_lgl.character() was calling toupper() twice — once inside are_lgl_ish.character() for validation, then again independently for conversion. This was the dominant allocation hotspot for character ...

I got about a 9x speed-up from my first "implement this in C" ticket for Github Copilot (github.com/wranglezone/...). It was already pretty fast, but now it's faster!
Setting it loose on some more character manipulation... #RStats #GenAI #CLang #IDontKnowThatHashtag