perf: cache json strings into const

[nigrosimone]

npm run bench:cmp

> fast-json-stringify@5.14.1 bench:cmp
> node ./benchmark/bench-cmp-branch.js

Select the branch you want to compare (feature branch):
cache-str
Select the branch you want to compare with (main branch):
master
Checking out "cache-str"
Execute "npm run bench"

> fast-json-stringify@5.14.1 bench
> node ./benchmark/bench.js

short string............................................. x 16,870,462 ops/sec ±2.49% (173 runs sampled)
unsafe short string...................................... x 724,139,578 ops/sec ±0.41% (186 runs sampled)
short string with double quote........................... x 8,446,363 ops/sec ±0.98% (187 runs sampled)
long string without double quotes........................ x 11,556 ops/sec ±0.44% (191 runs sampled)
unsafe long string without double quotes................. x 813,697,981 ops/sec ±1.28% (191 runs sampled)
long string.............................................. x 13,826 ops/sec ±1.17% (186 runs sampled)
unsafe long string....................................... x 886,199,677 ops/sec ±0.45% (190 runs sampled)
number................................................... x 885,289,169 ops/sec ±0.51% (189 runs sampled)
integer.................................................. x 186,926,499 ops/sec ±0.73% (190 runs sampled)
formatted date-time...................................... x 1,180,142 ops/sec ±1.01% (185 runs sampled)
formatted date........................................... x 770,533 ops/sec ±1.26% (184 runs sampled)
formatted time........................................... x 744,215 ops/sec ±1.54% (181 runs sampled)
short array of numbers................................... x 83,572 ops/sec ±2.01% (179 runs sampled)
short array of integers.................................. x 76,748 ops/sec ±1.77% (179 runs sampled)
short array of short strings............................. x 19,934 ops/sec ±0.44% (189 runs sampled)
short array of long strings.............................. x 18,284 ops/sec ±2.77% (177 runs sampled)
short array of objects with properties of different types x 8,478 ops/sec ±1.37% (176 runs sampled)
object with number property.............................. x 742,860,674 ops/sec ±0.44% (189 runs sampled)
object with integer property............................. x 155,007,833 ops/sec ±0.38% (191 runs sampled)
object with short string property........................ x 16,724,070 ops/sec ±1.23% (179 runs sampled)
object with long string property......................... x 11,640 ops/sec ±1.33% (186 runs sampled)
object with properties of different types................ x 1,683,099 ops/sec ±1.09% (188 runs sampled)
simple object............................................ x 8,467,288 ops/sec ±0.88% (189 runs sampled)
simple object with required fields....................... x 9,377,275 ops/sec ±1.91% (182 runs sampled)
object with const string property........................ x 883,884,078 ops/sec ±0.50% (190 runs sampled)
object with const number property........................ x 885,943,123 ops/sec ±0.45% (191 runs sampled)
object with const bool property.......................... x 887,473,685 ops/sec ±0.51% (191 runs sampled)
object with const object property........................ x 892,204,220 ops/sec ±0.45% (190 runs sampled)
object with const null property.......................... x 881,055,068 ops/sec ±0.65% (190 runs sampled)

Checking out "master"
Execute "npm run bench"

> fast-json-stringify@5.14.1 bench
> node ./benchmark/bench.js

short string............................................. x 16,912,799 ops/sec ±2.45% (174 runs sampled)
unsafe short string...................................... x 734,503,764 ops/sec ±1.31% (185 runs sampled)
short string with double quote........................... x 8,400,416 ops/sec ±1.60% (186 runs sampled)
long string without double quotes........................ x 11,088 ops/sec ±1.01% (179 runs sampled)
unsafe long string without double quotes................. x 738,669,891 ops/sec ±0.48% (189 runs sampled)
long string.............................................. x 11,958 ops/sec ±0.53% (190 runs sampled)
unsafe long string....................................... x 756,187,321 ops/sec ±0.37% (189 runs sampled)
number................................................... x 865,206,823 ops/sec ±1.02% (190 runs sampled)
integer.................................................. x 185,672,593 ops/sec ±0.84% (191 runs sampled)
formatted date-time...................................... x 1,123,406 ops/sec ±1.33% (185 runs sampled)
formatted date........................................... x 750,140 ops/sec ±1.30% (185 runs sampled)
formatted time........................................... x 755,195 ops/sec ±1.16% (184 runs sampled)
short array of numbers................................... x 88,025 ops/sec ±1.69% (179 runs sampled)
short array of integers.................................. x 75,908 ops/sec ±1.83% (181 runs sampled)
short array of short strings............................. x 19,657 ops/sec ±1.18% (189 runs sampled)
short array of long strings.............................. x 18,938 ops/sec ±1.49% (185 runs sampled)
short array of objects with properties of different types x 10,090 ops/sec ±1.62% (181 runs sampled)
object with number property.............................. x 887,652,574 ops/sec ±0.43% (191 runs sampled)
object with integer property............................. x 167,257,031 ops/sec ±2.11% (173 runs sampled)
object with short string property........................ x 16,206,991 ops/sec ±2.19% (177 runs sampled)
object with long string property......................... x 11,758 ops/sec ±1.09% (184 runs sampled)
object with properties of different types................ x 1,665,238 ops/sec ±1.71% (178 runs sampled)
simple object............................................ x 8,314,669 ops/sec ±1.03% (188 runs sampled)
simple object with required fields....................... x 7,716,424 ops/sec ±1.60% (176 runs sampled)
object with const string property........................ x 691,814,706 ops/sec ±0.54% (188 runs sampled)
object with const number property........................ x 688,577,394 ops/sec ±0.79% (186 runs sampled)
object with const bool property.......................... x 721,388,123 ops/sec ±2.22% (181 runs sampled)
object with const object property........................ x 839,403,044 ops/sec ±0.92% (187 runs sampled)
object with const null property.......................... x 881,096,651 ops/sec ±0.77% (191 runs sampled)

short string..............................................-0.25%
unsafe short string.......................................-1.41%
short string with double quote............................+0.55%
long string without double quotes.........................+4.22%
unsafe long string without double quotes.................+10.16%
long string..............................................+15.62%
unsafe long string.......................................+17.19%
number....................................................+2.32%
integer...................................................+0.68%
formatted date-time.......................................+5.05%
formatted date............................................+2.72%
formatted time............................................-1.45%
short array of numbers....................................-5.06%
short array of integers...................................+1.11%
short array of short strings..............................+1.41%
short array of long strings...............................-3.45%
short array of objects with properties of different types-15.98%
object with number property..............................-16.31%
object with integer property..............................-7.32%
object with short string property.........................+3.19%
object with long string property.............................-1%
object with properties of different types.................+1.07%
simple object.............................................+1.84%
simple object with required fields.......................+21.52%
object with const string property........................+27.76%
object with const number property........................+28.66%
object with const bool property..........................+23.02%
object with const object property.........................+6.29%
object with const null property...............................0%
Back to cache-str 651d0e0

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