tb.write does not allow for negative values
This is not a deal breaker, but it would be nice to have a way to write on -10, 2 for example.

I was trying to write just half of a box, something like this:
(0,0)
`
_________
|12345678|
|12345678|
|12345678|
---------------
`
Becomes something like this at (-4,0):
`
______
45678|
45678|
45678|
---------
`