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Confirming precedence order of Default for GUCs - Mailing list pgsql-sql

From Manav Kumar
Subject Confirming precedence order of Default for GUCs
Date
Msg-id CAPhCW+_sxtUDCcJd0=WN4iC6Ag33QQ0-ifrGY5mspSechVrb6A@mail.gmail.com
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Hi Team, 
Can you please correct me regarding the precedence order of overriding the DEFAULT values for GUC's.

Is it right to say, GUC passed in the start up packet will override the default value set by using ALTER DATABASE/ROLE. ? 
I've verified by running locally. 
But in the https://arc.net/l/quote/qnpjwhcw (DOCS) it says ALTER DATABASE/ROLE can override the cmd line options passed in startup packet. 
Also just below that paragraph for Interaction with Shell, it says about startup/cmd line options only overriding the default set via alter system or postgresql.conf

Please correct me is it correct order of applying the defaults:

1. Using start up packet (i.e using env var or passing cmd line option)
2. Using alter database/role
3. Setting via postgresql.conf or using alter system

Looking forward to hearing the response. 
Thanks
Manav

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