https://git.ruby-lang.org/ruby.git/commit/?id=f245976386

From f2459763862fa2eef6929557a87763fe5ff5c470 Mon Sep 17 00:00:00 2001
From: Mark Thorn <mcthorn@g...>
Date: Tue, 3 Mar 2020 10:03:28 -0800
Subject: [ruby/psych] Fix ArgumentError with leading and trailing underscores
 in number strings.

https://github.com/ruby/psych/commit/ac2d2c9b1b

diff --git a/ext/psych/lib/psych/scalar_scanner.rb b/ext/psych/lib/psych/scalar_scanner.rb
index cea2a45..d565a33 100644
--- a/ext/psych/lib/psych/scalar_scanner.rb
+++ b/ext/psych/lib/psych/scalar_scanner.rb
@@ -101,7 +101,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/scalar_scanner.rb#L101
     ###
     # Parse and return an int from +string+
     def parse_int string
-      Integer(string.gsub(/[,]/, ''))
+      Integer(string.gsub(/[,_]/, ''))
     end
 
     ###
diff --git a/test/psych/test_scalar_scanner.rb b/test/psych/test_scalar_scanner.rb
index d12a905..1bd6488 100644
--- a/test/psych/test_scalar_scanner.rb
+++ b/test/psych/test_scalar_scanner.rb
@@ -120,6 +120,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/test/psych/test_scalar_scanner.rb#L120
       assert_equal 123_456_789, ss.tokenize('123_456_789')
       assert_equal 123_456_789, ss.tokenize('123,456,789')
       assert_equal 123_456_789, ss.tokenize('1_2,3,4_5,6_789')
+      assert_equal 123_456_789, ss.tokenize('1_2,3,4_5,6_789_')
 
       assert_equal 0b010101010, ss.tokenize('0b010101010')
       assert_equal 0b010101010, ss.tokenize('0b0,1_0,1_,0,1_01,0')
@@ -129,6 +130,8 @@ module Psych https://github.com/ruby/ruby/blob/trunk/test/psych/test_scalar_scanner.rb#L130
 
       assert_equal 0x123456789abcdef, ss.tokenize('0x123456789abcdef')
       assert_equal 0x123456789abcdef, ss.tokenize('0x12_,34,_56,_789abcdef')
+      assert_equal 0x123456789abcdef, ss.tokenize('0x_12_,34,_56,_789abcdef')
+      assert_equal 0x123456789abcdef, ss.tokenize('0x12_,34,_56,_789abcdef__')
     end
   end
 end
-- 
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