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a9c5133a77
The custom sort functions used from the templates had some subtle data race- and related issues, especially when used in the single page template. This commit fixes this by making copies and protect the read and writes with a RWMutex. The results are cached (it will typically be invoked *number of pages* times with exactly the same data). This is, not surprisingly, also faster: ``` benchmark old ns/op new ns/op delta BenchmarkSortByWeightAndReverse 14228 491 -96.55% benchmark old allocs new allocs delta BenchmarkSortByWeightAndReverse 1 0 -100.00% benchmark old bytes new bytes delta BenchmarkSortByWeightAndReverse 32 0 -100.00% ``` Fixes #1293