Just so people this far down can look it up the term is Canonicalization, and its cousin collation. These are non-trivial issues that, thankfully, some very sm

Just so people this far down can look it up the term is Canonicalization, and its cousin collation. These are non-trivial issues that, thankfully, some very smart and/or experienced people have usually handled for us. However, they still frequently lead to all sorts of vulnerabilities. "Stuffing" attacks sometimes rely on these issues, as have several major crypto incidents.