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A couple comments. For vector-copy! Guile provides vector-move-left! and vector-move-right!, so that you can safely copy a vector onto itself (useful for implementing -insert/-delete). You don't really need the -left!/-right! distinction, so long as you check the TSTART vs. FSTART (if TSTART is smaller you copy left->right, if FSTART is smaller you copy right->left). So the API can remain the same but it's probably worth requiring in the SRFI that TARGET and VEC are allowed to be the same vector. For the CMP of vector-binary-search, is there a consensus on returning symbols? You could pass a < predicate which is consistent with the sort SRFI and allows use of built-ins like string-ci<?, or use a comparator with a positive/negative/zero as in C which allows the use of the built-in - procedure. -- Alex