Expansions for array assignment not documented

[E. Choroba]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.4 
-L/home/abuild/rpmbuild/BUILD/bash-4.4/../readline-7.0
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' 
-DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -fmessage-length=0 
-grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong 
-funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g  
-D_GNU_SOURCE -DRECYCLES_PIDS -Wall -g -Wuninitialized -Wextra -Wno-switch-enum 
-Wno-unused-variable -Wno-unused-parameter -Wno-parentheses -ftree-loop-linear 
-pipe -DBNC382214=0 -DIMPORT_FUNCTIONS_DEF=0 -fprofile-use -fprofile-correction
uname output: Linux triangle 4.12.14-lp151.28.44-default #1 SMP Fri Mar 20 
18:20:20 UTC 2020 (dbf1aea) x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu

Bash Version: 4.4
Patch Level: 23
Release Status: release

Description:
    Expansions in an assignment are documented under "SIMPLE COMMAND EXPANSION":

    > The text after the = in each variable assignment undergoes tilde
    > expansion, parameter expansion, command substitution, arithmetic
    > expansion, and quote removal before being assigned to the
    > variable.

    However, a compound assignment to an array is different: the
    values also undergo pathname and brace expansions:

        files=(*)
        numbers=({1..10})

    Originally discovered by Roland at
    https://stackoverflow.com/q/61267714/1030675.


Repeat-By:
    I've searched the whole "man bash" for "array" and haven't found
    this documented. It's possible I've missed the documentation.

Fix:
    The additional expansions should be documented either in the
    paragraph quoted above, or in the "ARRAYS" section where compound
    assignment is described.

Cheers,

Ch.