[ruby-core:77666] [Ruby trunk Bug#12852] URI.parse can't handle non-ascii URIs

Issue #12852 has been reported by Olivier Lacan.

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Bug #12852: URI.parse can't handle non-ascii URIs
https://bugs.ruby-lang.org/issues/12852

* Author: Olivier Lacan
* Status: Open
* Priority: Normal
* Assignee: akira yamada
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Given a return URL path like: `/search?utf8=\u{2713}&q=foo`, `URI.parse` raises the following exception: 

```ruby
URI.parse "/search?utf8=\u{2713}&q=foo"
URI::InvalidURIError: URI must be ascii only "/search?utf8=\u{2713}&q=foo"
```

This `\u{2713}` character is commonly used by web frameworks like Rails to enforce UTF-8 in forms: https://github.com/rails/rails/blob/92703a9ea5d8b96f30e0b706b801c9185ef14f0e/actionview/lib/action_view/helpers/form_tag_helper.rb#L823-L830

```ruby
"\u{2713}"
=> "✓"
```

Is it unreasonable to expect non-ascii portion of URIs to be handled by URI.parse? The way to circumvent this issue is to call URI.encode on the URI string prior to passing it to URI.parse:

```ruby
URI.parse URI.encode("/search?utf8=\u{2713}&q=foo")
=> #<URI::Generic /search?utf8=%E2%9C%93&q=foo>
```

By comparison, a library like Addressable parses this URI without issue.

```
require "addressable/uri"
=> #<Addressable::URI:0x3feffa84158c URI:/search?utf8=✓&q=foo>
```

This is how Addressable implements parsing:
https://github.com/sporkmonger/addressable/blob/a15b7045a09911bcc47b106200554809c879a5f6/lib/addressable/uri.rb#L75-L145

PS: Tried under MRI 2.3.1 and 2.4.0-preview1



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