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diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/upcase.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/upcase.rb
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+#
+# upcase.rb
+# Please note: This function is an implementation of a Ruby class and as such may not be entirely UTF8 compatible. To ensure compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
+#
+module Puppet::Parser::Functions
+ newfunction(:upcase, :type => :rvalue, :doc => <<-DOC
+ Converts a string or an array of strings to uppercase.
+
+ *Examples:*
+
+ upcase("abcd")
+
+ Will return:
+
+ ABCD
+ DOC
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "upcase(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.size != 1
+
+ value = arguments[0]
+
+ unless value.is_a?(Array) || value.is_a?(Hash) || value.respond_to?(:upcase)
+ raise(Puppet::ParseError, 'upcase(): Requires an array, hash or object that responds to upcase in order to work')
+ end
+
+ if value.is_a?(Array)
+ # Numbers in Puppet are often string-encoded which is troublesome ...
+ result = value.map { |i| function_upcase([i]) }
+ elsif value.is_a?(Hash)
+ result = {}
+ value.each_pair do |k, v|
+ result[function_upcase([k])] = function_upcase([v])
+ end
+ else
+ result = value.upcase
+ end
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :