Custom integer-like type

[Ivan Voras <ivoras@xxxxxxxxxxx>]

Hello,

I'm creating a new data in C, and everything is proceeding well, except
that the data type should be parsed on input like an integer. Maybe it's
best if I explain it with an example:

Currently, I can do this:

INSERT INTO t(my_data_type) VALUES ('1')

but I cannot do this:

INSERT INTO t(my_data_type) VALUES (1)

My type is defined as:

CREATE TYPE myint (
   internallength = variable,
   input = encbigint_in,
   output = encbigint_out,
   alignment = int4,
   storage = external
);

(The "variable" length is correct in this case.)

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