1	#!/bin/bash
2	#
3	# Arrays decay upon assignment (without splicing) and equality. This will not
4	# be true in Oil -- arrays will be first class.
5
6	### Assignment Causes Array Decay
7	set -- x y z
8	#argv "[$@]" # NOT DECAYED here.
9	var="[$@]"
10	argv.py "$var"
11	# stdout: ['[x y z]']
12
13	### User arrays decay
14	declare -a a b
15	a=(x y z)
16	b="${a[@]}" # this collapses to a string
17	c=("${a[@]}") # this preserves the array
18	c[1]=YYY # mutate a copy -- doesn't affect the original
19	argv.py "${a[@]}" "${b[@]}" "${c[@]}"
20	# stdout: ['x', 'y', 'z', 'x y z', 'x', 'YYY', 'z']
21
22	### $a gives first element of array
23	a=(1 '2 3')
24	echo $a
25	# stdout: 1
26