Michael Muré 5cea53af26 perf(constants): avoid allocating a map for each Decode*() call ...

```
goos: linux
goarch: amd64
pkg: github.com/ucan-wg/go-varsig
cpu: 13th Gen Intel(R) Core(TM) i7-1360P
                         │    old.txt    │               new.txt                │
                         │    sec/op     │    sec/op     vs base                │
DecodeHashAlgorithm-16     145.65n ± 10%   59.62n ± 30%  -59.07% (p=0.000 n=10)
DecodePayloadEncoding-16   136.65n ± 46%   50.02n ±  5%  -63.40% (p=0.000 n=10)
geomean                     141.1n         54.60n        -61.29%

                         │  old.txt   │               new.txt               │
                         │    B/op    │    B/op     vs base                 │
DecodeHashAlgorithm-16     48.00 ± 0%   48.00 ± 0%       ~ (p=1.000 n=10) ¹
DecodePayloadEncoding-16   48.00 ± 0%   48.00 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    48.00        48.00       +0.00%
¹ all samples are equal

                         │  old.txt   │               new.txt               │
                         │ allocs/op  │ allocs/op   vs base                 │
DecodeHashAlgorithm-16     1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
DecodePayloadEncoding-16   1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=10) ¹
geomean                    1.000        1.000       +0.00%
¹ all samples are equal
```

2025-07-08 16:53:40 +02:00

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