Float references in a register

Float references in a register

[Duncan Hothersall]

Is it possible to have float references (i.e. Table 1.1) alongside page
numbers in a register?

I've never come across it before, but I've just been asked to produce an
index which has entries like:

coverage measurement tools  176-177, Table 6.5

I have looked through core-reg without much illumination. I wonder if I
can use \writetoregister but experiments thus far haven't been successful.

Is this sort of thing supported/supportable?

Thanks,

Duncan