Commits on Aug 21, 2016

1. cstring: avoid excessive growth just to 0-terminate …

   Based on following what happens in CString::new("string literal"):
   
   1. Using `Into<Vec<u8>>`, a Vec is allocated with capacity exactly equal
      to the string's input length.
   2. By `v.push(0)`, the Vec is grown to twice capacity, since it was full.
   3. By `v.into_boxed_slice()`, the Vec capacity is shrunk to fit the length again.
   
   If we use `.reserve_exact(1)` just before the push, then we avoid the
   capacity doubling that we're going to have to shrink anyway.
   
   Growing by just 1 byte means that the step (2) is less likely to have to
   move the memory to a larger allocation chunk, and that the step (3) does
   not have to reallocate.

   

   bluss committed Aug 21, 2016
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