Lay foundation for validation of approximation #1053
Merged
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I'm having some trouble in #1019, and as I found out, the reason is an invalid approximation. I have code in a local branch that validates the approximation (which is the reason I was able to find out). This validation code can't be merged yet, unfortunately. The reason for that is hard to explain, and at the same time not that interesting. The gist of it is, #97 is in the way.
#1019 addresses #97, but can't be merged yet, as I haven't fixed the problem yet. I'm working on it, but in the meantime, I'd like to get this PR merged. It contains as much of the validation work as is practical, along some associated cleanups of the approximation code.