Can we overload = operator to word numeric = text

Hello,

We have migrated oracle database to postgre.
In oracle char to numeric type conversion is explicit (i.e. we can compare
char = numeric); but in postgre it is throwing errors. There are so many
functions - around 2000, and we can not go and do explict type casting in
every function , where there is problem.

Is there any way to come out of this problem. I mean is there any way to
make = operator work for numeric = charater varying .
Your suggestions are highly appreciated.

Venkat
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