feat: unroll skipStr loop

[tdakkota]

Valid/bools.json-4           2.19µs ± 0%    2.21µs ± 2%   +1.03%  (p=0.005 n=12+15)
Valid/canada.json-4          4.96ms ± 1%    4.99ms ± 2%     ~     (p=0.093 n=12+15)
Valid/citm_catalog.json-4    2.63ms ± 2%    2.40ms ± 1%   -8.71%  (p=0.000 n=15+14)
Valid/floats.json-4          3.86µs ± 1%    3.84µs ± 2%   -0.58%  (p=0.032 n=14+13)
Valid/large.json-4           62.8µs ± 3%    47.6µs ± 1%  -24.21%  (p=0.000 n=14+14)
Valid/medium.json-4          4.68µs ± 1%    3.73µs ± 2%  -20.23%  (p=0.000 n=15+13)
Valid/nulls.json-4           2.02µs ± 2%    2.02µs ± 2%     ~     (p=0.289 n=14+14)
Valid/otel_ex_1.json-4        925ns ± 2%     662ns ± 3%  -28.46%  (p=0.000 n=14+14)
Valid/small.json-4            452ns ± 3%     394ns ± 2%  -12.85%  (p=0.000 n=15+15)
Valid/tiny.json-4            61.5ns ± 2%    65.7ns ± 3%   +6.82%  (p=0.000 n=14+14)
Valid/twitter.json-4         1.15ms ± 3%    0.83ms ± 0%  -27.60%  (p=0.000 n=14+12)

[codecov]

Codecov Report

Merging #22 (c048666) into main (0493760) will decrease coverage by 0.07%.
The diff coverage is 97.46%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   99.19%   99.11%   -0.08%     
==========================================
  Files          29       29              
  Lines        2106     2158      +52     
==========================================
+ Hits         2089     2139      +50     
- Misses         13       15       +2     
  Partials        4        4              

Impacted Files	Coverage Δ
w_str.go	100.00% <ø> (ø)
dec_skip.go	98.37% <97.46%> (-0.37%)	⬇️

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