perf: improve request pool performance for pointer types

[abemedia]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f1e519f) 95.87% compared to head (b9978c8) 95.87%.

❗ Current head b9978c8 differs from pull request most recent head e2f2eec. Consider uploading reports for the commit e2f2eec to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   95.87%   95.87%           
=======================================
  Files          23       24    +1     
  Lines         848      848           
=======================================
  Hits          813      813           
  Misses         24       24           
  Partials       11       11           

Impacted Files	Coverage Δ
nilcheck.go	100.00% <100.00%> (ø)
pool.go	100.00% <100.00%> (ø)
unsafe.go	100.00% <100.00%> (ø)

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[github-actions]

Benchmark Results

.

goos: linux
goarch: amd64
pkg: github.com/abemedia/go-don
cpu: Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
                         │   before    │                after                │
                         │   sec/op    │   sec/op     vs base                │
Handler/Request-2          342.2n ± 1%   344.8n ± 1%        ~ (p=0.101 n=10)
Handler/RequestPointer-2   436.1n ± 1%   368.6n ± 1%  -15.47% (p=0.000 n=10)
geomean                    386.3n        356.5n        -7.71%

                         │   before   │                after                │
                         │    B/op    │    B/op     vs base                 │
Handler/Request-2          24.00 ± 0%   24.00 ± 0%       ~ (p=1.000 n=10) ¹
Handler/RequestPointer-2   24.00 ± 0%   24.00 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    24.00        24.00       +0.00%
¹ all samples are equal

                         │   before   │                after                │
                         │ allocs/op  │ allocs/op   vs base                 │
Handler/Request-2          1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
Handler/RequestPointer-2   1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    1.000        1.000       +0.00%
¹ all samples are equal