[pull] master from ruby:master - #1339
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The pattern of allocating an empty hash with `rb_hash_new()` and then appending to it is relatively wasteful, because every time we go over the hash capacity, we'll have to `realloc`, rehash etc. It may even get worse if #18345 lands, as right now an empty hash starts with a capacity of 8, but it may very well start with a capacity of 2. Hence in cases where the final hash size is easy to predict, we should use `rb_hash_new_capa()`.
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