utils: add special serializer for numpy.int64 #492
Merged
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I don't know if this is papering over another issue but it looks to fix the issue for me :)
It looks like COUNT(*) returns a numpy.int64 value that the
default JSONEncoder does not handle.
While at if we get a type we are not handling make it easier to
debug the issue by throwing a TypeError exception with useful
data.
Fix #486