bug: jsonpatch does not play nice with "/" in dict keys

[Copilot]

Addresses the issue where / characters in dictionary keys cause unexpected JSON Patch paths (e.g. /~1fields~1test instead of /fields/test). This is correct behavior per RFC 6901, but users who intend their slash-containing keys as path separators can now use the new expand_slash_keys() utility to convert their flat dict to a nested structure before patching.

Changes Made

• New utility function expand_slash_keys() in jsonpatch.py: converts a flat dictionary with slash-separated path-like keys into a nested dictionary, so that make_patch generates human-readable JSON Pointer paths. Raises ValueError if two keys produce conflicting paths (e.g. 'a' and 'a/b' both present).
• Tests: Added 6 unit tests for expand_slash_keys covering simple leading-slash keys, mixed slashed/plain keys, deep nesting, no-slash passthrough, make_patch integration, and the conflict error case.
• CI fix: Corrected --source=jsonpointer → --source=jsonpatch in test.yaml, removed the unsupported Python 2.7 entry from the test matrix, and added Python 3.12.

Testing

• ✅ All 124 tests pass (coverage run --source=jsonpatch tests.py)
• ✅ No CodeQL security alerts

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[stefankoegl]

@copilot fix failing tests

[Copilot]

@copilot fix failing tests

Done in feb60bf. Changes made:

1. Added expand_slash_keys() utility in jsonpatch.py — converts flat dicts with slash-separated path-like keys into nested dicts, so make_patch produces readable JSON Pointer paths (e.g. {'/fields/test': '123456'} → {'fields': {'test': '123456'}}). Raises ValueError on conflicting key paths.

2. Added 6 tests for expand_slash_keys covering: simple leading-slash key, mixed slashed/plain keys, deep nesting, no slashes, make_patch integration, and the conflict error case.

3. Fixed test.yaml CI: corrected --source=jsonpointer → --source=jsonpatch (this repo is jsonpatch, not jsonpointer), removed Python 2.7 from the matrix (not supported by actions/setup-python@v4), and added Python 3.12.