NUMBER return types (Decimal/Int16/Int32) how does it work?

We ran into a problem with a stored procedure returning the result of a select (using Fill method).
Sometimes some data comes back as int32, sometimes the same data has decimal as datatype.
We've been struggling to get the same datatype back all the time for the same column. Unfortunately so far without success. The problem is that these columns are part of our key and we can't use a 'relation' between them if the datatypes are int32/decimal: they don't match.
To simulate the problem:
Create table myTest (col1 number(2));
insert a row (e.g. 12)
SELECT col1 FROM myTest
this becomes an Int16 when retrieved.
now comes the strange part:
SELECT col1 FROM myTest
UNION
SELECT 0 FROM DUAL
returns an DECIMAL.
We tried:
SELECT col1 FROM myTest
UNION
SELECT TO_NUMBER(0,2) FROM DUAL
but this does not work, it still returns an Decimal (expected Int16).
We tried to make the to_number into an outer select, we tried to create an UDT and populate that one, we tried a lot but did not succeed in get a guaranteed Int32 back.
Any ideas on how to resolve this?

Out of curiosity
what does
"select TO_NUMBER(0,2) from dual" returns? A Decimal or Int16?
Maybe (i am really guessing here) the union stmt returns a NUMBER(x,y) type which will cause the provider to gives you back a Decimal .net type.
Arnold

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NUMBER return types (Decimal/Int16/Int32) how does it work?

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