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Decreases allocations and bytes per operation by using string builder with a predefined size. One additional allocation has been removed by using its own implementation of Strings(). The reason behind this was due to the fact the calls to .String() are more recurrent than .Strings() and the performance impact was worth the code duplication. Benchmark results: cpu: 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz name old time/op new time/op delta ReferenceStringSymbolic-16 140ns ± 4% 40ns ± 9% -71.19% (p=0.008 n=5+5) ReferenceStringHash-16 174ns ±14% 85ns ± 4% -51.13% (p=0.008 n=5+5) ReferenceStringInvalid-16 48.9ns ± 2% 1.5ns ± 3% -96.96% (p=0.008 n=5+5) name old alloc/op new alloc/op delta ReferenceStringSymbolic-16 88.0B ± 0% 32.0B ± 0% -63.64% (p=0.008 n=5+5) ReferenceStringHash-16 176B ± 0% 144B ± 0% -18.18% (p=0.008 n=5+5) ReferenceStringInvalid-16 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta ReferenceStringSymbolic-16 4.00 ± 0% 1.00 ± 0% -75.00% (p=0.008 n=5+5) ReferenceStringHash-16 5.00 ± 0% 3.00 ± 0% -40.00% (p=0.008 n=5+5) ReferenceStringInvalid-16 0.00 0.00 ~ (all equal) Signed-off-by: Paulo Gomes <pjbgf@linux.com>
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