std::io::mem: add a with_capacity constructor to MemWriter. #10737
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This allows one to reduce the number of reallocs of the internal buffer if one has an approximate idea of the size of the final output.
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This allows one to reduce the number of reallocs of the internal buffer if one has an approximate idea of the size of the final output.
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This allows one to reduce the number of reallocs of the internal buffer
if one has an approximate idea of the size of the final output.