[ruby-dev:52030] [Ruby master Feature#19193] drop DOS TEXT mode support

["YO4 (Yoshinao Muramatsu) via ruby-dev" <ruby-dev@ml.ruby-lang.org>]

Issue #19193 has been updated by YO4 (Yoshinao Muramatsu).


> The most important reason we are keeping "text mode" at reading is backward interoperability for old files.

agree too.

Interoperability with the unix environment is becoming increasingly important.
So, when writing CRLF newline it is better to specify it explicitly.

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Feature #19193: drop DOS TEXT mode support
https://bugs.ruby-lang.org/issues/19193#change-100728

* Author: YO4 (Yoshinao Muramatsu)
* Status: Assigned
* Priority: Normal
* Assignee: usa (Usaku NAKAMURA)
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On Windows platform, ```File.open(path, "r")``` returns an object different from "rt" and "rb". I call that DOS TEXT mode here.

DOS TEXT mode does
* crlf conversion
* 0x1a treated EOF charactor on read

and others (see Bug #19192).
But DOS TEXT mode is almost unnecessary today and it seems to introduce lot of code complexities.

Now there is less need for dos text mode
* Microsoft's most apps works without CRLF newline.
* Creating a crlf text file today should be explicit. (but that is default mode on windows now)
* Interpreting EOF charactor can cause trouble.

I think it's time to consider dropping DOS TEXT mode.
What challenges are there and what preparation is needed?




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