New file HACKS which explains various performance hacks in the library
New file HACKS which explains various performance hacks in the library

Ignore-this: f5574db02a347fc5e7510e49c910f2f2

darcs-hash:20100219043905-b2b0a-8971de2d8a4728ee2d4f2641e0d1c216b8684046

rleshchinskiy/vector