[ruby-dev:52019] [Ruby master Feature#19193] drop DOS TEXT mode support

["usa (Usaku NAKAMURA)" <noreply@ruby-lang.org>]

Issue #19193 has been updated by usa (Usaku NAKAMURA).


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

agree.

> Are many of text files using LF newlines nowadays on Windows?

I don't think so.
For example, Excel 2021 outputs CRLF newlines when creating a CSV file.

Reading as text mode and writing as binary mode by default seems to be a reasonable chioice.
But are the complexity acceptable bv users?

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Feature #19193: drop DOS TEXT mode support
https://bugs.ruby-lang.org/issues/19193#change-100568

* 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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