[ruby-core:88200] [Ruby trunk Bug#14805] Enumerator#count is silently limited to int32

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Issue #14805 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED

ruby_2_4 r64125 merged revision(s) 63549,63551,63554.

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Bug #14805: Enumerator#count is silently limited to int32
https://bugs.ruby-lang.org/issues/14805#change-73219

* Author: amadan (Goran Topic)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]
* Backport: 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED
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One takes for granted that integers will be promoted into bigints in Ruby when needed.
Not so with `Enumerator#count`:

    2147483647.times.count
    # => 2147483647 
    2147483648.times.count
    # => -2147483648

(notice the minus!)



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