https://git.ruby-lang.org/ruby.git/commit/?id=9901bb4c73

From 9901bb4c73131ca80a1924d45425d8011a591cbd Mon Sep 17 00:00:00 2001
From: Burdette Lamar <BurdetteLamar@Y...>
Date: Mon, 15 Jun 2020 16:43:36 -0500
Subject: [ruby/csv] Add missing file doc/argument_io.rdoc (#140)

https://github.com/ruby/csv/commit/e37f04aa5c

diff --git a/doc/argument_io.rdoc b/doc/argument_io.rdoc
new file mode 100644
index 0000000..f5fe1d1
--- /dev/null
+++ b/doc/argument_io.rdoc
@@ -0,0 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/doc/argument_io.rdoc#L1
+* Argument +io+ should be an IO object that is:
+  * Open for reading; on return, the IO object will be closed.
+  * Positioned at the beginning.
+    To position at the end, for appending, use method CSV.generate.
+    For any other positioning, pass a preset \StringIO object instead.
-- 
cgit v0.10.2


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