Simplify format checks

[blakeembrey]

Marginal perf bump by validating control characters together. Small simplification on object validation for bytes.

Before:

 ✓ src/format.bench.ts > format 4276ms
     name                                       hz     min     max    mean     p75     p99    p995    p999     rme  samples
   · format with simple credentials   3,758,643.72  0.0001  3.4189  0.0003  0.0003  0.0003  0.0004  0.0015  ±1.43%  1879322
   · format with long credentials     2,887,119.72  0.0002  0.2407  0.0003  0.0003  0.0004  0.0005  0.0026  ±0.34%  1443560
   · format with unicode credentials  3,628,485.19  0.0002  0.2014  0.0003  0.0003  0.0003  0.0004  0.0010  ±0.30%  1814243
   · format with special characters   3,538,610.78  0.0002  6.7937  0.0003  0.0003  0.0003  0.0004  0.0014  ±2.68%  1769306

After:

 ✓ src/format.bench.ts > format 4275ms
     name                                       hz     min     max    mean     p75     p99    p995    p999     rme  samples
   · format with simple credentials   3,810,883.80  0.0002  0.6533  0.0003  0.0003  0.0003  0.0004  0.0015  ±0.34%  1905442
   · format with long credentials     2,866,106.83  0.0002  0.2182  0.0003  0.0003  0.0004  0.0005  0.0014  ±0.34%  1433054
   · format with unicode credentials  3,657,358.93  0.0002  0.3126  0.0003  0.0003  0.0003  0.0004  0.0008  ±0.32%  1828680
   · format with special characters   3,490,155.23  0.0002  0.1538  0.0003  0.0003  0.0003  0.0004  0.0009  ±0.27%  1745078

It's not a huge improvement so we could just leave it, but I don't see any reason not to include it 🤷

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (fcfd3a3) to head (6e23775).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #107   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           41        38    -3     
  Branches        13        10    -3     
=========================================
- Hits            41        38    -3     

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