doc/common.txt

bdiff: check and cast first parameter value on putbe32() calls

Eliminates

  mercurial/bdiff.c(383) : warning C4244: 'function' : conversion from '__int64'
  to 'uint32_t', possible loss of data
  mercurial/bdiff.c(384) : warning C4244: 'function' : conversion from '__int64'
  to 'uint32_t', possible loss of data
  mercurial/bdiff.c(385) : warning C4244: 'function' : conversion from
  'Py_ssize_t' to 'uint32_t', possible loss of data

when compiling for Windows x64 target using the Microsoft compiler.

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