[ApparentlyTejas]

Fixes #381.

ceil() and floor() pass their argument straight to math.ceil/math.floor, which raise on infinity and NaN:

>>> import json, jmespath
>>> jmespath.search('floor(@)', json.loads('Infinity'))
OverflowError: cannot convert float infinity to integer
>>> jmespath.search('ceil(@)', json.loads('NaN'))
ValueError: cannot convert float NaN to integer

json.loads accepts Infinity/NaN by default, so data loaded the usual way can contain them. The @signature({"types": ['number']}) decorator doesn't catch this — inf/nan are still Python float, which maps to the JMESPath "number" type; the check only validates the type category, not finiteness.

Every other invalid-argument case in functions.py raises exceptions.JMESPathTypeError, so OverflowError/ValueError leaking out here means code that catches JMESPathError around search() doesn't catch these. Went with raising JMESPathTypeError (matching the existing convention) rather than returning the value unchanged, since that keeps the "callers catch JMESPathError" contract intact.