Resolve issue trying to splat union of named tuples

src/spectator/matchers/failed_match_data.cr

@@ -14,6 +14,10 @@ module Spectator::Matchers
     # Additional information from the match that can be used to debug the problem.
     getter values : Array(Tuple(Symbol, String))
 
+    # Creates the match data.
+    def initialize(@failure_message, @values)
+    end
+
     # Creates the match data.
     def initialize(@failure_message, **values)
       @values = values.to_a

src/spectator/matchers/standard_matcher.cr

@@ -27,7 +27,7 @@ module Spectator::Matchers
       if match?(actual)
         SuccessfulMatchData.new
       else
-        FailedMatchData.new(failure_message(actual), **values(actual))
+        FailedMatchData.new(failure_message(actual), values(actual).to_a)
       end
     end
 
@@ -42,7 +42,7 @@ module Spectator::Matchers
       if does_not_match?(actual)
         SuccessfulMatchData.new
       else
-        FailedMatchData.new(failure_message_when_negated(actual), **negated_values(actual))
+        FailedMatchData.new(failure_message_when_negated(actual), negated_values(actual).to_a)
       end
     end