[Help-bash] bash lazy evaluation with -a

[Ken Goldman]

(checking before I report a bug)

I inherited some code that looks like this:

        if [ $# -gt 3 -a $3 = "-ks" ];then
                EC_SIGNING_KEY_SIZE=$4
        fi

When I run with 2 arguments, I get:

        rpm.sh: line 514: [: too many arguments

I think the coder expected the left side of the -a to be false, and thus 
the right side would not be evaluated.  Certainly C code does that.  I 
suspect that my invocation with $3 empty causes the error.

Is this implementation dependent and thus a bug, or is my analysis wrong?