Fix poor error with infix:<xx> with non-numeric Str
Fix poor error with infix:<xx> with non-numeric Str

When '123aaa' is given, the Failure occurs inside the coercion,
which we then attempt to store in a native int, triggering a bad error

Fix by moving the coercer into the Num() multi, where such a Failure
would explode in the .Int method.

Fixes RT#130288: https://rt.perl.org/Ticket/Display.html?id=130288

P.S: this is probably a deeper issue with our coercers; IIRC there's
a ticket that they don't check the final type.

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