perf: Allow writing json without serde

[epage]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 16429188500

Details

• 82 of 285 (28.77%) changed or added relevant lines in 7 files are covered.
• 20 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-2.6%) to 33.26%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/json-write/src/key.rs	6	12	50.0%
crates/json-write/src/write.rs	0	20	0.0%
crates/libtest-json/src/event.rs	0	87	0.0%
crates/json-write/src/value.rs	58	148	39.19%

Files with Coverage Reduction	New Missed Lines	%
crates/libtest2-mimic/tests/testsuite/util.rs	1	84.51%
crates/libtest2/tests/testsuite/util.rs	1	84.51%
crates/libtest-json/tests/roundtrip.rs	6	0.0%
crates/libtest-json/src/event.rs	12	0.0%

Totals
Change from base Build 16428945515:	-2.6%
Covered Lines:	456
Relevant Lines:	1371

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💛 - Coveralls