Some ufuncs does not support complex types or behave differently compared with NumPy.

• rint (Support rounding for complex types #1282)
• log1p, expm1, log2 (Support expm1, log1p, log2 for complex type #1283)
• logaddexp
• fmin, fmax (Fix binary functions in misc to support complex types #1285)
• sign, square (Fix unary functions in misc for complex #1284)