[#102652] [Ruby master Bug#17664] Behavior of sockets changed in Ruby 3.0 to non-blocking — ciconia@...
Issue #17664 has been reported by ciconia (Sharon Rosner).
23 messages
2021/02/28
[ruby-core:102514] [Ruby master Bug#17631] `Numeric#real?` incorrectly returns true for `NaN` and `INFINITY`
From:
muraken@...
Date:
2021-02-16 03:25:20 UTC
List:
ruby-core #102514
Issue #17631 has been updated by mrkn (Kenta Murata). IEEE754 follows the extended real number system that is a real number system with positive and negative Infinities. So, at least, `Float::INFINITY.real?` can return `true`. `BigDecimal` also employs the extended real number system, so `BigDecimal::INFINITY.real?` can be `true`, too. `Float::NAN` and `BigDecimal::NAN` are not-a-number, so `real?` of them may be reasonable to be `false` depending on the definition of the method. ---------------------------------------- Bug #17631: `Numeric#real?` incorrectly returns true for `NaN` and `INFINITY` https://bugs.ruby-lang.org/issues/17631#change-90407 * Author: jtannas (Joel Tannas) * Status: Open * Priority: Normal * ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- In mathematics, infinity is not a real number. See https://math.stackexchange.com/a/750787 I don't have a source for this, but I also believe that `NaN` is not a real number. `Numeric#real?` incorrectly returns `true` for both of these cases. ``` ruby irb(main):001:0> Float::INFINITY.real? => true irb(main):002:0> Float::NAN.real? => true irb(main):003:0> require 'bigdecimal' => true irb(main):004:0> BigDecimal::NAN.real? => true irb(main):005:0> BigDecimal::INFINITY.real? => true ``` I ran into this while doing some math with logarithms, leading me to have to put in weird catches like `return nil if result.complex? || result.nan? || result.infinite?` --- Originally reported here: https://stackoverflow.com/q/64795265/7950458 -- https://bugs.ruby-lang.org/ Unsubscribe: <mailto:[email protected]?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>