Column name case conversion

Hello,

Column names are behaving very strangely. In queries, all names are
converted to lowercase.

Example:

I have a table named "LOCATION".

select * from location;
I get an error message (this is OK)

select * from LOCATION;
I get an error message (this is NOT OK)

select * from "location";
I get an error message (this is OK)

select * from "LOCATION";
Everything works (this is OK)

Is it by design? I think that database shouldn't convert name case in SQL
statements, or it should try to make case-insensitive match (like
Interbase) if double quotes are not used.