[ruby-core:119856] [Ruby master Feature#20882] Provide Boolean(...)

Issue #20882 has been updated by bkuhlmann (Brooke Kuhlmann).


In case it's of interest, I use my [Refinements](https://alchemists.io/projects/refinements#_to_bool) gem for this. Example:

``` ruby
using Refinements::String

ENV["SOME_FEATURE"].to_bool             # Either `true` or `false` depending on the resolved value.
ENV.fetch("SOME_FEATURE", "0").to_bool  # `false`
```

----------------------------------------
Feature #20882: Provide Boolean(...)
https://bugs.ruby-lang.org/issues/20882#change-110545

* Author: getajobmike (Mike Perham)
* Status: Open
----------------------------------------
Ruby provides Integer(...) and Float(...) global methods to coerce values. Is there a similar method for Booleans?

I'd like to do something like:

```
# ENV["SOME_FEATURE"] is unset
Boolean(ENV["SOME_FEATURE"]) # => false

# ENV["SOME_FEATURE"] is unset, but allow a default?
Boolean(ENV["SOME_FEATURE"], true) # => true

# explicitly disable
ENV["SOME_FEATURE"] = "0"
Boolean(ENV["SOME_FEATURE"], true) # => false

# explicitly enable
ENV["SOME_FEATURE"] = "1"
Boolean(ENV["SOME_FEATURE"]) # => true
```



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