Use fast key hash for parsing

[dduan]

Replace String.hashValue with a lightweight FNV-1a hash for key
prefiltering to reduce hashing overhead during parse and table lookups.

[github-actions]

Comparing results between 'main' and 'pull_request'

Host 'runnervmh13bl' with 4 'x86_64' processors with 15 GB memory, running:
#18~24.04.1-Ubuntu SMP Sat Jun 28 04:46:03 UTC 2025

TOMLDecoderBenchmarks

Decode toml.io example metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (μs) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	70	71	71	72	75	89	132	7016
pull_request	67	68	68	69	73	88	148	7161
Δ	-3	-3	-3	-3	-2	-1	16	145
Improvement %	4	4	4	4	3	1	-12	145

Retains: results within specified thresholds, fold down for details.

Retains *	p0	p25	p50	p75	p90	p99	p100	Samples
main	626	626	626	627	627	627	627	7016
pull_request	626	626	626	626	626	626	626	7161
Δ	0	0	0	-1	-1	-1	-1	145
Improvement %	0	0	0	0	0	0	0	145

Parse toml.io example metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (ns) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	6592	6755	6795	6855	6935	10751	31529	10000
pull_request	6221	6363	6403	6463	6543	9527	26440	10000
Δ	-371	-392	-392	-392	-392	-1224	-5089	0
Improvement %	6	6	6	6	6	11	16	0

Retains: results within specified thresholds, fold down for details.

Retains *	p0	p25	p50	p75	p90	p99	p100	Samples
main	9	10	10	10	10	10	10	10000
pull_request	9	10	10	10	10	10	10	10000
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

decode canada.toml metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (ms) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	270	270	270	271	271	271	271	4
pull_request	262	262	263	265	265	265	265	4
Δ	-8	-8	-7	-6	-6	-6	-6	0
Improvement %	3	3	3	2	2	2	2	0

Retains: results within specified thresholds, fold down for details.

Retains (K) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	1674	1674	1674	1674	1674	1674	1674	4
pull_request	1674	1674	1674	1674	1674	1674	1674	4
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

decode twitter.toml metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (μs) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	9420	9486	9503	9535	9585	9806	9979	105
pull_request	8883	8937	8954	8995	9044	9462	10056	111
Δ	-537	-549	-549	-540	-541	-344	77	6
Improvement %	6	6	6	6	6	4	-1	6

Retains: results within specified thresholds, fold down for details.

Retains (K) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	66	66	66	66	66	66	66	105
pull_request	66	66	66	66	66	66	66	111
Δ	0	0	0	0	0	0	0	6
Improvement %	0	0	0	0	0	0	0	6

parse GitHub events archive metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (ms) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	178	178	179	180	180	180	180	6
pull_request	165	165	166	170	171	171	171	6
Δ	-13	-13	-13	-10	-9	-9	-9	0
Improvement %	7	7	7	6	5	5	5	0

Retains: results within specified thresholds, fold down for details.

Retains (K) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	77	77	77	77	77	77	77	6
pull_request	77	77	77	77	77	77	77	6
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

parse canada.toml metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (ms) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	16	17	18	18	18	19	19	57
pull_request	16	17	17	18	18	19	19	58
Δ	0	0	-1	0	0	0	0	1
Improvement %	0	0	6	0	0	0	0	1

Retains: results within specified thresholds, fold down for details.

Retains *	p0	p25	p50	p75	p90	p99	p100	Samples
main	133	134	134	134	134	134	134	57
pull_request	133	134	134	134	134	134	134	58
Δ	0	0	0	0	0	0	0	1
Improvement %	0	0	0	0	0	0	0	1

parse twitter.toml metrics

Time (wall clock): results within specified thresholds, fold down for details.

Time (wall clock) (μs) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	2927	2966	2980	2992	3006	3289	3481	330
pull_request	2734	2755	2763	2773	2798	2916	3813	354
Δ	-193	-211	-217	-219	-208	-373	332	24
Improvement %	7	7	7	7	7	11	-10	24

Retains: results within specified thresholds, fold down for details.

Retains *	p0	p25	p50	p75	p90	p99	p100	Samples
main	1293	1294	1294	1294	1294	1294	1294	330
pull_request	1293	1294	1294	1294	1294	1294	1294	354
Δ	0	0	0	0	0	0	0	24
Improvement %	0	0	0	0	0	0	0	24