Hi!
Is there some other reason / use case for wanting exceptions? So, I mean, where is the use case where '123abc' will be passed to a type-hinted field where you could catch the exception and do something meaningful to carry on with the execution of the program other than simply error-ing out?
Pretty much everywhere. Suppose you have form with, say, 2 fields and first field does not validate. Maybe you want to check the second field too and give the user both errors if they are both wrong?
In general, looking at strict typing as user input validation mechanism is a very bad idea. There are specialized use input validation functions/classes/frameworks, and one should use them.
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