Scales don't squish to zero-range domains #5279
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This PR aims to fix #5271.
Briefly,
reciprocal_trans()'s domains are [-Inf, Inf]. The reciprocal of this domain is [0,0]. The limits get squished to [0,0]. We cannot compute breaks on this. Hence, in this PR, we refuse to squish limits to zero-range domains.Moreover, it adds a series of tests for computing breaks with almost all transformd (boxcox is broken though), so we might see better when we might break a particular transfomation.