Added PMC_data_typed() and PMC_data0_typed() macros to make casting easier.
Added PMC_data_typed() and PMC_data0_typed() macros to make casting easier.

I don't know if this will satisfy *all* compilers, so it might need more
parentheses.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@18184 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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