[ruby-core:91331] [Ruby trunk Bug#15518] good old Infinite range notation behavior

Issue #15518 has been updated by naruse (Yui NARUSE).

Backport changed from 2.4: DONTNEED, 2.5: DONTNEED, 2.6: REQUIRED to 2.4: DONTNEED, 2.5: DONTNEED, 2.6: DONE

ruby_2_6 r66949 merged revision(s) 66947.

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Bug #15518: good old Infinite range notation behavior
https://bugs.ruby-lang.org/issues/15518#change-76582

* Author: sakuro (Sakuro OZAWA)
* Status: Closed
* Priority: Normal
* Assignee: mrkn (Kenta Murata)
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin18]
* Backport: 2.4: DONTNEED, 2.5: DONTNEED, 2.6: DONE
----------------------------------------
Ruby 2.5.3's behavior

~~~
# without step, it produces integer sequence
(1..Float::INFINITY).first(10) #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# with step, it produces floats instead of integers
(1..Float::INFINITY).step(1).first(10) #=> [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0]
~~~

Ruby 2.6.0's behavior

~~~
# endless range
(1..).first(10) #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# with step, all numbers are integer now
(1..).step(1).first(10) #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

# old idiom with Float::INFINITY
(1..Float::INFINITY).first(10) #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
(1..Float::INFINITY).step(1).first(10) #=> FloatDomainError (Infinity)
~~~

Which are intended change and which are not?




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