mm-coding-system-equal
mm-coding-system-equal is an alias for `coding-system-equal' in `mm-util.el
'.
(mm-coding-system-equal CODING-SYSTEM-1 CODING-SYSTEM-2)
Return t if and only if CODING-SYSTEM-1 and CODING-SYSTEM-2 are identical.
Two coding systems are identical if both symbols are equal
or one is an alias of the other.