The right way to pack cl_float into cl_sampler_properties

[SunSerega]

In #931:

Note that there is a weird potential mismatch between cl_context_properties, which is currently an intptr_t

It's already common, for the cl_*_properties list to accept types with different sizes.
For instance, CL_CONTEXT_INTEROP_USER_SYNC is followed by cl_bool, which is cl_uint with only 1 bit used. Well, it can just be padded with zeroes on 64-bit systems.

But now that I looked at it - there is an even weirder case:
https://man.opencl.org/clCreateSamplerWithProperties.html
CL_SAMPLER_LOD_MIN is followed by cl_float. But how is this cl_float converted to intptr_t cl_ulong?

• Bitwise? But that would be awkward when language without pointers uses OpenCL bindings.
• Rounding? But then why use cl_float in the first place...