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ts_rank error/result of '1e-020'

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I have a workaround to the error/result, but am wondering what the result of ts_rank of '1e-020' represents?

Here is the original:

select
ts_rank(to_tsvector('a_a_do_ug_read_retreqmon_ptam'),to_tsquery('a_a_do_ug_read_retrmso.com_ptam'))



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