shadowed rel_ops operators

[Gabriel Dos Reis]

Richard Andrews <richarda@ixla.com.au> writes:

[...]

| I'm sure we've only seen a small fraction of the areas rel_ops can interfere with. 
| Maybe there should be a section in a FAQ or info page somewhere dedicated to known conflicts.

I favor a FAQ entry over warning in the header.

And we should take care to sequestre std::rel_ops in a dedicated header.

-- Gaby
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