step -1

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Floyd

Keep in mind that "Step -1" is not subtraction. It ADDS -1 to the loop variable.

There is no number -1 for a byte, so -1 is replaced by the equivalent 255. The original example becomes

Local t:Byte
For t=10 to 0 Step 255     ' used to be -1
Next

and the loop is never entered.

You can also get bizarre results with ordinary integers by using an inappropriate step size.

Local n:Int

For n = 1 To 2000000000 Step 600000000
    Print n
Next

Here the problem is that we step past the final value while wrapping around to negative numbers. The loop doesn't terminate until we land on a suitably large positive number.