transforms {'4.2': 'foo'} into {'42': 'foo'}

[hyposlasher]

camelcase-keys transforms {'4.2': 'foo'} into {'42': 'foo'} i.e. removes decimal point

[sindresorhus]

That is technically the correct behavior. There's no . in a camel-cased string.

However, I agree, it's never the wanted result, so we can skip the key if it's a valid number.