feat: add a few utils

[Primetalk]

fix #110
fix #109
fix #108
fix #107
fix #106
fix #105
fix #104
fix #103
fix #102
fix #101
fix #100

[codecov]

Codecov Report

Base: 83.20% // Head: 84.08% // Increases project coverage by +0.88% 🎉

Coverage data is based on head (3c3ea37) compared to base (8e8615a).
Patch coverage: 95.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   83.20%   84.08%   +0.88%     
==========================================
  Files          38       42       +4     
  Lines        1840     1923      +83     
==========================================
+ Hits         1531     1617      +86     
+ Misses        271      267       -4     
- Partials       38       39       +1     

Impacted Files	Coverage Δ
fun/numbers.go	80.00% <80.00%> (ø)
slice/slice.go	89.67% <93.75%> (+6.64%)	⬆️
fun/pair.go	75.00% <100.00%> (+41.66%)	⬆️
fun/predicate.go	100.00% <100.00%> (ø)
io/io.go	79.26% <100.00%> (+0.51%)	⬆️
io/io_slice.go	100.00% <100.00%> (ø)
slice/numbers.go	100.00% <100.00%> (ø)
stream/chunks.go	100.00% <100.00%> (ø)
stream/construct.go	90.00% <100.00%> (+1.11%)	⬆️
stream/stream.go	83.74% <100.00%> (+0.01%)	⬆️
... and 3 more

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