Doubt in the reserved key words

hii all
jut by mistake i found this unusual
SET SERVEROUTPUT ON;
DECLARE
NUMBER VARCHAR2 (100) := 'Everything''s Fine!';--number used as a variable name
BEGIN
DBMS_OUTPUT.put_line (NUMBER);
END;
anonymous block completed
Everything's Fine!
if replace number with integer it will still not give me error can any 1 explain y is this happening

Hi,
It's best not to use keywords (such as NUMBER) as variable names (or column names, or any other identifier). Sometimes you can get away with it, but then you might make some minor change and that will start raising an error. (Sometimes the change can be upgrading to a new version.) It's a bad idea, even if you don;t get punished for it right now.

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Doubt in the reserved key words

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