Complex#rationalize and to_r with approximate zeros
Currently, Complex#rationalize and Complex#to_r raise a RangeError if the imaginary part is nonzero or is a Float. Note that a BigDecimal(0) is accepted, though:
Complex(1, 0).to_r # => Rational(1,1) Complex(1, BigDecimal("0.0")).to_r # => Rational(1,1) Complex(1, 0.0).to_r # => RangeError
This is inconsistent. I recommend not raising an error for 0.0 (Float or BigDecimal). Any objection?
#1 [ruby-core:38891] Updated by Kenta Murata over 5 years ago
- Assignee set to Kenta Murata
0.0 doesn't exactly represent zero. It may be 0.0+-10.0**(Float::MIN_10_EXP-17).
BigDecimal(0) doesn't exactly represent zero, too.
I believe this issue should be resolved by introducing Numeric#exact? and/or Numeric#inexact? methods.