It had been acting as though the last registered clipboard format always
matched any pasteboard type.

This allows that gl functions are available for different extensions,
e.g. "glVertexP2ui" which is new GL_ARB_vertex_type_2_10_10_10_rev and
also in GL_VERSION_3_3. It is valid to get that function for each gl
version when GL_ARB_vertex_type_2_10_10_10_rev is in the extension list.
On the other hand that function is available, when the gl version is >= 3.3.