I have the following code

if (msg.position == 0)
    //removed for brevity
else if (msg.position == txtArea.value.length)
    //removed for brevity
} else {
    //ERROR: should not reach here.
    errorDivTag.innerHTML += msg.position + " " + txtArea.value.length;
}

I'm having some really weird situations where I'm getting the error in the last code block, but the printed positions show that msg.position is in fact equal to the txtArea.value.length. This only happens 1% of the time, almost as if I have some kind of race-condition in my code where the two are NOT equal during the second if statement, but equal when I print in the error message.

Any ideas?