Add check-impl? from SRFI 273 to SRFI 253 code - #1145
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While SRFI 273 is not yet finalized, its check-impl? part is likely to be finalized unaltered, because implementation-specific type checking is important.
Thus this pull request adding
check-impl?as a procedure checking the type of the argument. No syntax required, as type checking is runtime and not compile-time.