ZSH support for hexadecimal and octal literals isn't POSIX compliant

[laurenthuberdeau]

Hexadecimal

ZSH rewrites hexadecimal to base#literal which then breaks the [ command because it expects the operands to in base 10 (without the 10x prefix). This can be fixed by wrapping the hexadecimal literal in an arithmetic expansion to force the conversion to base 10.

Small example showing the issue:

: $((foo = 1))
: $((foo += 0x10))
echo "$foo"
[ "$foo" -ne 0 ]

Octal

ZSH doesn't parse octal literals (with a leading 0) unless the OCTAL_ZEROES option is enabled.