From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2023-01-13T15:06:33+00:00
Subject: [ruby-core:111803] [Ruby master Bug#19335] Integer#remainder and Numeric#remainder should respect #coerce

Issue #19335 has been updated by nobu (Nobuyoshi Nakada).


https://github.com/ruby/ruby/pull/7120

----------------------------------------
Bug #19335: Integer#remainder and Numeric#remainder should respect #coerce
https://bugs.ruby-lang.org/issues/19335#change-101214

* Author: kyanagi (Kouhei Yanagita)
* Status: Open
* Priority: Normal
* Assignee: mrkn (Kenta Murata)
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin21]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Thinking of the result of the following, `Integer#remainder` and `Numeric#remainder` should respect `#coerce`.
(`BigDecimal#remainder` seems to respect `#coerce`.)

```Ruby
c = Object.new
def c.coerce(other)
  [other, 10]
end

p 1234 / c          # => 123
p 1234.div(c)       # => 123
p 1234.quo(c)       # => (617/5)
p 1234.fdiv(c)      # => 123.4
p 1234 % c          # => 4
p 1234.modulo(c)    # => 4
p 1234.divmod(c)    # => [123, 4]
p 1234.remainder(c) # => in `remainder': comparison of Object with 0 failed (ArgumentError)

p 1234.0 / c          # => 123.4
p 1234.0.div(c)       # => 123
p 1234.0.quo(c)       # => 123.4
p 1234.0.fdiv(c)      # => 123.4
p 1234.0 % c          # => 4.0
p 1234.0.modulo(c)    # => 4.0
p 1234.0.divmod(c)    # => [123, 4.0]
p 1234.0.remainder(c) # => in `remainder': comparison of Object with 0 failed (ArgumentError)

require 'bigdecimal'
p BigDecimal('1234.0').remainder(c) # => 0.4e1
```




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