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${a:=b} expands to `b', not `a''s value

From: Oğuz
Subject: ${a:=b} expands to `b', not `a''s value
Date: Wed, 20 Jan 2021 13:16:12 +0200

    $ declare -l a
    $ echo "${a:=X} $a"
    X x

This doesn't jive with what the manual says.

> When the variable is assigned a value, all upper-case characters are
converted to lower-case.

> If parameter is unset or null, the expansion of word is assigned to
parameter. The value of parameter is then substituted.

Is this a bug or am I missing something here?


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