chore: performance improvement on asStringSmall

[nigrosimone]

Comparing more values in a single if statement has a little performance hit instead of make multiple if statement. In general, combining multiple comparisons into one if statement might result in slightly better performance due to reduced overhead from evaluating conditions and executing multiple control flow structures. This is because combining conditions can reduce the number of times the JavaScript engine has to evaluate expressions and jump between different parts of the code.

benchmark (master VS PR)

short string............................................. x 16,634,103 ops/sec ±2.06% (182 runs sampled)

short string............................................. x 18,920,179 ops/sec ±1.07% (184 runs sampled)

PR seems better!

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

[Uzlopak]

makes sense

[mcollina]

lgtm