o not have such an operator in data modelling, so I
&gt;      have been applying a stricter test of "is the same thing".
&gt;      It is useful to know the local conventions.

I do not know what context you are referring to here.
The last time that I remember using an equal sign in
quotes it was merely to underscore a straightforward
reading of "is".  When questions of equality get any
more involved than that I will typically use several
standard devices, like "square bracket" operators to
signify "the deno