Snowflake to_varchar adds space in front

Anyone can explain why to_varchar function in Snowflake adds space in front of output:

For example,

SELECT TO_VARCHAR(10101, '000000');
-- ouput: ' 010101'
SELECT LEN(TO_VARCHAR(10101, '000000'))
-- ouput: 7

I could wrap it with TRIM, but would like to understand behavior instead of adding unnecessary functions

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