No start attribute.
- Should be 1
- Should be 2
start
- Should be 1
- Should be 2
start=""
- Should be 1
- Should be 2
start=" 2 "
- Should be 2
- Should be 3
start="+2"
- Should be 2
- Should be 3
start="A2"
- Should be 1
- Should be 2
start=".2"
- Should be 1
- Should be 2
start="#2"
- Should be 1
- Should be 2
start="0"
- Should be 0
- Should be 1
start=" 0 "
- Should be 0
- Should be 1
start="2"
- Should be 2
- Should be 3
start="-2"
- Should be -2
- Should be -1