Merge pull request #21596 from JuanitoFatas/perf/strip-heredoc

Improve String#strip_heredoc

activesupport/lib/active_support/core_ext/string/strip.rb

@@ -20,7 +20,6 @@ class String
   # Technically, it looks for the least indented non-empty line
   # in the whole string, and removes that amount of leading whitespace.
   def strip_heredoc
-    indent = scan(/^[ \t]*(?=\S)/).min.try(:size) || 0
-    gsub(/^[ \t]{#{indent}}/, '')
+    gsub(/^#{scan(/^[ \t]*(?=\S)/).min}/, ''.freeze)
   end
 end