Are spaces valid in SWIs ?

[dp111]

In tube-swi.c tube_SWI_NumberFromString are spaces valid ? if not then we should be using ">" instead of ">=".

[hoglet67]

This is the behaviour I see on RISCOS 3.1 in Arculator:

So it looks like space is treated as a valid terminator, rather than as a valid character.

I'll update the code to use >