On several occasions I have wanted to input integers in hexadecimal rather
than in decimal in PostgreSQL. I notice that there is a to_hex function,
but there is not (AFAIK) a way to provide an integer in hexadecimal.

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I have written a pure-sql implementation of some functions to input
integers in hexadecimal
(http://postgresql.jdrake.com/hex-int-in.sql.html), but it is less than
efficient ;)
Is there some reason why hex input is not currently supported? What would
be the preferred way to implement it?
1. A function (or one for each int[248]), essentially from_hex(text)
2. Support in the input functions for int[248] for integers that start
with '0[Xx]' as with strtol with base set to 0.
3. Support in the grammar for integral constants 0[Xx][0-9A-Fa-f]+
Thoughts? Is this a legitimate TODO?
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