Commits on Jun 19, 2024

1. rangeproof: add unit test for malleating single-value proofs …

   I was a bit confused reading `secp256k1_rangeproof_getheader_impl`
   because in the case of single-value proofs (`has_nz_range == 0`) some
   bits of the header are unconstrained. At first I thought this was a
   malleability vector. And I think I've had this same confusion in the
   past.
   
   But in fact it is not a malleability vector because the whole header
   gets hashed into the proof.
   
   Add a unit test to confirm this to reduce future confusion.

   

   apoelstra committed Jun 19, 2024
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