[OS X Compilation Fix] Resolve ambiguous call with as_buffer#3

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AlJaMa wants to merge 1 commit intoAstron:masterfrom

AlJaMa:bugfix/osx_size_t

Commits on Nov 5, 2014

[OS X Compilation Fix] Added as_buffer(unsigned long r) to resolve ambiguity with size_t on OS X + clang.
AlJaMa
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