Bug report

When you try to serialize aNaN,inf or-inf withjson.dumps(..., allow_nan=False), the error messages are inconsistent, depending on whether you use theindent argument or not.

>>>json.dumps(float('nan'),allow_nan=False)ValueError:OutofrangefloatvaluesarenotJSONcompliant>>>json.dumps(float('nan'),allow_nan=False,indent=4)ValueError:OutofrangefloatvaluesarenotJSONcompliant:nan

That is because if you don't useindent, the encoding is done in C codehere,
but if you useindent, the encoding is done in pure Python codehere, and the error messages are different between the two.

Your environment

• CPython versions tested on: 3.11.0
• Operating system and architecture: MacOS 12.6, Apple Silicon

Linked PRs

• gh-99925: Fix inconsistency injson.dumps() error messages #99926