[racket-dev] safe version of racket/unsafe/ops?

I'm sure I'm just missing something obvious here, but is there a library that provides things like "unsafe-vector-length" that are actually references to the safe versions? I have a core dump occurring in (someone else's) unsafe code, and I'd much rather just import a different library than go through and take out the "unsafe" everywhere.  I know that TR has such a library (mutatis mutandis).  If it doesn't already exist, could I create 

racket/unsafe/safe-ops

?

John

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