Rust 1.34, including a subtle issue with a function that should have been unsafe, and a slew of new numeric types! https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html
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Playing with optional type signatures in Python, I realise that the return type is the most important to me.
I'd much rather have a function with only a return type instead of a function with only parameter types. It's often quick to add too.
I'm never sure how to convert words with hyphens into SCREAMING_SNAKE_CASE. For example, should built-in function be BUILT_IN_FUNCTION or BUILTIN_FUNCTION?
... and my third refactoring with Cursor changed some function calls that I didn't want it to modify. Subtle.
I've had the most success with AI coding tools when I know exactly what I want the output to look like.