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f73d0ed1d9
This is for `TODO: use map to reduce cancel cost`. I switched slice to map, and benchmark results show that map implementation performs better, as follows: ``` [1]: benchmark old ns/op new ns/op delta BenchmarkWatchableStoreUnsyncedCancel 215212 1307 -99.39% BenchmarkWatchableStoreUnsyncedCancel-2 120453 710 -99.41% BenchmarkWatchableStoreUnsyncedCancel-4 120765 748 -99.38% BenchmarkWatchableStoreUnsyncedCancel-8 121391 719 -99.41% benchmark old allocs new allocs delta BenchmarkWatchableStoreUnsyncedCancel 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-2 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-4 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkWatchableStoreUnsyncedCancel 200 1 -99.50% BenchmarkWatchableStoreUnsyncedCancel-2 138 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-4 138 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-8 139 0 -100.00% [2]: benchmark old ns/op new ns/op delta BenchmarkWatchableStoreUnsyncedCancel 212550 1117 -99.47% BenchmarkWatchableStoreUnsyncedCancel-2 120927 691 -99.43% BenchmarkWatchableStoreUnsyncedCancel-4 120752 699 -99.42% BenchmarkWatchableStoreUnsyncedCancel-8 121012 688 -99.43% benchmark old allocs new allocs delta BenchmarkWatchableStoreUnsyncedCancel 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-2 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-4 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkWatchableStoreUnsyncedCancel 197 1 -99.49% BenchmarkWatchableStoreUnsyncedCancel-2 138 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-4 138 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-8 139 0 -100.00% [3]: benchmark old ns/op new ns/op delta BenchmarkWatchableStoreUnsyncedCancel 214268 1183 -99.45% BenchmarkWatchableStoreUnsyncedCancel-2 120763 759 -99.37% BenchmarkWatchableStoreUnsyncedCancel-4 120321 708 -99.41% BenchmarkWatchableStoreUnsyncedCancel-8 121628 680 -99.44% benchmark old allocs new allocs delta BenchmarkWatchableStoreUnsyncedCancel 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-2 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-4 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkWatchableStoreUnsyncedCancel 200 1 -99.50% BenchmarkWatchableStoreUnsyncedCancel-2 139 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-4 138 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-8 139 0 -100.00% [4]: benchmark old ns/op new ns/op delta BenchmarkWatchableStoreUnsyncedCancel 208332 1089 -99.48% BenchmarkWatchableStoreUnsyncedCancel-2 121011 691 -99.43% BenchmarkWatchableStoreUnsyncedCancel-4 120678 681 -99.44% BenchmarkWatchableStoreUnsyncedCancel-8 121303 721 -99.41% benchmark old allocs new allocs delta BenchmarkWatchableStoreUnsyncedCancel 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-2 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-4 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkWatchableStoreUnsyncedCancel 194 1 -99.48% BenchmarkWatchableStoreUnsyncedCancel-2 139 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-4 139 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-8 139 0 -100.00% [5]: benchmark old ns/op new ns/op delta BenchmarkWatchableStoreUnsyncedCancel 211900 1097 -99.48% BenchmarkWatchableStoreUnsyncedCancel-2 121795 753 -99.38% BenchmarkWatchableStoreUnsyncedCancel-4 123182 700 -99.43% BenchmarkWatchableStoreUnsyncedCancel-8 122820 688 -99.44% benchmark old allocs new allocs delta BenchmarkWatchableStoreUnsyncedCancel 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-2 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-4 0 0 +0.00% BenchmarkWatchableStoreUnsyncedCancel-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkWatchableStoreUnsyncedCancel 198 1 -99.49% BenchmarkWatchableStoreUnsyncedCancel-2 140 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-4 141 0 -100.00% BenchmarkWatchableStoreUnsyncedCancel-8 141 0 -100.00% ```