This works between C and Lua.
In C the pinfo.private_table pointer must be initialized using
g_hash_table_new (g_str_hash, g_str_equal);
In Lua the values are available using pinfo.private.<key>, and the
table is created automatically on first usage. It's possible to use
this datatypes: nil, boolean, number and string, but every value
is converted to string so numbers must be converted using tonumber()
on usage. Boolean is either nil or an empty string.
svn path=/trunk/; revision=39461
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