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This function returns t if object is a character.
Some functions that work on integers (e.g. the comparison functions
<, <=, =, /=, etc. and the arithmetic functions +, -, *, etc.)
accept characters and implicitly convert them into integers. In
general, functions that work on characters also accept char-ints and
implicitly convert them into characters. WARNING: Neither of these
behaviors is very desirable, and they are maintained for backward
compatibility with old E-Lisp programs that confounded characters and
integers willy-nilly. These behaviors may change in the future; therefore,
do not rely on them. Instead, convert the characters explicitly
using char-int.
This function returns t if object is an integer or character.