Add weak order to solvers?

[lockwo]

strong order is a attribute of the SDE solvers, but they also possess a weak order. Is there any reason not to include weak order as well (or should it wait until the first weak solver is going in)?

[patrick-kidger]

I left these off mostly because I didn't feel like tracking them down for every solver! A lot of these just aren't well-documented.

That aside it's just not that useful -- strong order is used in the theory of adaptive stepping, so it is needed programmatically. The same isn't true for weak.