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"The feature is not meant to encourage developers to use 'my_cat' and 'myCat' randomly within the same file."

I'm sure it's not, but it isn't doing a thing to discourage that. We stopped using case insensitive file systems a long time ago, didn't we?

...actually we didn't.

> We stopped using case insensitive file systems a long time ago, didn't we?

Windows didn't.

But even Windows doesn't use an underscore-insensitive file system.