[scrollaway]

Ergh, I get what you're trying to prevent, but this actively breaks those custom safe parsers we build, and now you have to do some additional active parsing. Please don't do this, just set contractual expectations in your API.

[hannofcart]

Politely, I think this comment may be incorrect advice.

I think correctness and precision requirements of financial transactions outweighs any devex concerns. Lots of banking and trading APIs do exactly this: pass your currency fields as strings.