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Remove caveat for older Ruby's dup behavior [ci skip]

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In older Ruby, nil, Symbol, Fixnum, Rational, and Complex were not
duplicable. In Ruby 2.5, all of them are duplicable.
This commit is contained in:
Ryuta Kamizono 2019-07-16 03:42:16 +09:00
parent 83c6ea3a25
commit 998fa9b158
1 changed files with 0 additions and 9 deletions
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guides/source/active_support_core_extensions.md
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@ -155,15 +155,6 @@ Complex(1).duplicable? # => true
1.method(:+).duplicable? # => false
```
`duplicable?` matches the current Ruby version's `dup` behavior,
so results will vary according the version of Ruby you're using.
In Ruby 2.4, for example, Complex and Rational are not duplicable:
```ruby
Rational(1).duplicable? # => false
Complex(1).duplicable? # => false
```
WARNING: Any class can disallow duplication by removing `dup` and `clone` or raising exceptions from them. Thus only `rescue` can tell whether a given arbitrary object is duplicable. `duplicable?` depends on the hard-coded list above, but it is much faster than `rescue`. Use it only if you know the hard-coded list is enough in your use case.
NOTE: Defined in `active_support/core_ext/object/duplicable.rb`.