Re^2: shift vs @_

[ikegami]

if 0(zero) is acceptable then don't do this.

More specifically, if one of the following is acceptable, then don't do this:

• 0 (numeical zero),
• '0' (the string consisting exactly of the character zero),
• '' (the zero-length string),
• undef (the undefined value), or
• something that evaluates to one of the above in boolean context