Pretty significant catch if interoperability is a concern at all. Whitespace is easy enough to handle but how do dict keys get ordered? Are unquoted numbers with high precision output as-is or truncated to floats/JS Numbers? Is scientific notation ever used and if so when?
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.
Pretty significant catch if interoperability is a concern at all. Whitespace is easy enough to handle but how do dict keys get ordered? Are unquoted numbers with high precision output as-is or truncated to floats/JS Numbers? Is scientific notation ever used and if so when?