fix: consistently handle string in array

[qwelias]

Closes #662

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

Notes

• changed buildTest to compare parsed-FJS vs parsed-JSON because some things (like Date, and in general anything with .toJSON) cannot be parsed back after stringification
• removed !(${input} instanceof Date check beacuse earlier we already do || instanceof Date
• toString check is giga questionable, real JSON.stringify behavior ignores toString and instead uses toJSON, see:
  • MDN
  • try in REPL: JSON.stringify({toString:() => 'json'}) vs JSON.stringify({toJSON:() => 'json'})

[mcollina]

lgtm

[Uzlopak]

How are the benchmarks?

[qwelias]

On my machine

the branch:

FJS creation x 7,971 ops/sec ±2.16% (90 runs sampled)
CJS creation x 222,214 ops/sec ±0.26% (95 runs sampled)
AJV Serialize creation x 99,653,679 ops/sec ±0.15% (97 runs sampled)
JSON.stringify array x 6,123 ops/sec ±0.32% (94 runs sampled)
fast-json-stringify array default x 9,499 ops/sec ±0.18% (97 runs sampled)
fast-json-stringify array json-stringify x 10,286 ops/sec ±0.38% (96 runs sampled)
compile-json-stringify array x 10,646 ops/sec ±0.58% (94 runs sampled)
AJV Serialize array x 10,249 ops/sec ±0.22% (95 runs sampled)
JSON.stringify large array x 287 ops/sec ±0.51% (90 runs sampled)
fast-json-stringify large array default x 154 ops/sec ±0.49% (44 runs sampled)
fast-json-stringify large array json-stringify x 298 ops/sec ±0.32% (89 runs sampled)
compile-json-stringify large array x 500 ops/sec ±0.12% (84 runs sampled)
AJV Serialize large array x 180 ops/sec ±0.20% (83 runs sampled)
JSON.stringify long string x 11,912 ops/sec ±0.82% (87 runs sampled)
fast-json-stringify long string x 12,163 ops/sec ±0.78% (90 runs sampled)
compile-json-stringify long string x 11,692 ops/sec ±0.78% (87 runs sampled)
AJV Serialize long string x 29,725 ops/sec ±0.30% (96 runs sampled)
JSON.stringify short string x 14,207,086 ops/sec ±0.67% (96 runs sampled)
fast-json-stringify short string x 49,478,443 ops/sec ±0.24% (96 runs sampled)
compile-json-stringify short string x 40,336,032 ops/sec ±2.34% (82 runs sampled)
AJV Serialize short string x 39,007,070 ops/sec ±0.60% (92 runs sampled)
JSON.stringify obj x 3,775,135 ops/sec ±0.90% (94 runs sampled)
fast-json-stringify obj x 14,007,933 ops/sec ±0.10% (94 runs sampled)
compile-json-stringify obj x 25,083,170 ops/sec ±1.34% (93 runs sampled)
AJV Serialize obj x 14,928,476 ops/sec ±0.46% (93 runs sampled)
JSON stringify date x 1,107,942 ops/sec ±0.45% (95 runs sampled)
fast-json-stringify date format x 1,653,662 ops/sec ±0.32% (96 runs sampled)
compile-json-stringify date format x 1,106,712 ops/sec ±0.48% (94 runs sampled)

base commit:

FJS creation x 8,502 ops/sec ±1.95% (87 runs sampled)
CJS creation x 219,254 ops/sec ±0.19% (98 runs sampled)
AJV Serialize creation x 99,928,845 ops/sec ±0.36% (96 runs sampled)
JSON.stringify array x 6,164 ops/sec ±0.17% (96 runs sampled)
fast-json-stringify array default x 9,777 ops/sec ±0.70% (94 runs sampled)
fast-json-stringify array json-stringify x 9,841 ops/sec ±0.31% (96 runs sampled)
compile-json-stringify array x 9,816 ops/sec ±0.35% (93 runs sampled)
AJV Serialize array x 9,107 ops/sec ±0.31% (95 runs sampled)
JSON.stringify large array x 300 ops/sec ±0.26% (89 runs sampled)
fast-json-stringify large array default x 155 ops/sec ±0.14% (87 runs sampled)
fast-json-stringify large array json-stringify x 299 ops/sec ±0.50% (89 runs sampled)
compile-json-stringify large array x 462 ops/sec ±0.25% (87 runs sampled)
AJV Serialize large array x 161 ops/sec ±0.69% (82 runs sampled)
JSON.stringify long string x 13,013 ops/sec ±0.33% (93 runs sampled)
fast-json-stringify long string x 13,204 ops/sec ±0.24% (96 runs sampled)
compile-json-stringify long string x 13,228 ops/sec ±0.12% (96 runs sampled)
AJV Serialize long string x 29,119 ops/sec ±0.32% (96 runs sampled)
JSON.stringify short string x 13,938,511 ops/sec ±0.08% (93 runs sampled)
fast-json-stringify short string x 48,387,569 ops/sec ±0.26% (93 runs sampled)
compile-json-stringify short string x 46,779,630 ops/sec ±0.22% (97 runs sampled)
AJV Serialize short string x 47,391,463 ops/sec ±0.60% (94 runs sampled)
JSON.stringify obj x 3,911,040 ops/sec ±0.23% (95 runs sampled)
fast-json-stringify obj x 13,328,137 ops/sec ±0.27% (93 runs sampled)
compile-json-stringify obj x 25,501,630 ops/sec ±0.25% (93 runs sampled)
AJV Serialize obj x 12,396,970 ops/sec ±0.71% (94 runs sampled)
JSON stringify date x 1,086,867 ops/sec ±0.16% (98 runs sampled)
fast-json-stringify date format x 1,673,385 ops/sec ±0.35% (92 runs sampled)
compile-json-stringify date format x 1,141,811 ops/sec ±0.18% (97 runs sampled)

[mcollina]

lgtm