Add json fuzzer with seed files from #1123 and test suite

...as well as some cases generated in CI from earlier attempts at
fixing this.

1 files changed, 695 insertions, 0 deletions

diff --git a/fuzz/json_fuzzer_seed_corpus/28f697cab47c193f27469643f935b62442b7fb89 b/fuzz/json_fuzzer_seed_corpus/28f697cab47c193f27469643f935b62442b7fb89
new file mode 100644
index 00000000..4ce4c512
--- /dev/null
+++ b/fuzz/json_fuzzer_seed_corpus/28f697cab47c193f27469643f935b62442b7fb89
@@ -0,0 +1,695 @@
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