refactor: avoid double JSON parsing #232

Job	Run time
checks / pre-commit	38s
checks / readme-snippets	12s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.11, locked, windows-latest)	2m 27s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.10, locked, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	2m 46s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.12, locked, windows-latest)	4m 14s
checks / test (3.13, lowest-direct, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, windows-latest)	2m 15s
checks / test (3.14, locked, windows-latest)	4m 4s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.13, locked, windows-latest)	2m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, windows-latest)	2m 20s
checks / test (3.12, lowest-direct, windows-latest)	3m 15s
all-green	5s
	39m 34s

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