YAML fixes

src/yaml.cr

@@ -168,18 +168,17 @@ module YAML
   # Checks to see if the value is reserved
   def self.reserved_value?(value)
     return true if YAML::RESERVED_VALUES.includes?(value)
-    reserved = case {value[0]?, value[1]?, value[2]?, value[3]?, value[4]?}
-               when {.try(&.ascii_number?), .try(&.ascii_number?), .try(&.ascii_number?), .try(&.ascii_number?), '-'}
-                 (Time::Format::ISO_8601_DATE_TIME.parse(value) rescue false)
-               when {.try(&.ascii_number?), _, _, _, _},
-                    {'-', .try(&.ascii_number?), _, _, _},
-                    {'+', .try(&.ascii_number?), _, _, _},
-                    {'.', .try(&.ascii_number?), _, _, _},
-                    {'-', '.', .try(&.ascii_number?), _, _},
-                    {'+', '.', .try(&.ascii_number?), _, _}
-                 clean_value = value.gsub('_', "")
-                 clean_value.to_f64? || clean_value.to_i64?(prefix: true)
-               end
-    !reserved.nil?
+    case {value[0]?, value[1]?, value[2]?, value[3]?, value[4]?}
+    when {.try(&.ascii_number?), .try(&.ascii_number?), .try(&.ascii_number?), .try(&.ascii_number?), '-'}
+      !!(Time::Format::ISO_8601_DATE_TIME.parse(value) rescue false)
+    when {.try(&.ascii_number?), _, _, _, _},
+         {'-', .try(&.ascii_number?), _, _, _},
+         {'+', .try(&.ascii_number?), _, _, _},
+         {'.', .try(&.ascii_number?), _, _, _},
+         {'-', '.', .try(&.ascii_number?), _, _},
+         {'+', '.', .try(&.ascii_number?), _, _}
+      clean_value = value.gsub('_', "")
+      !!clean_value.to_f64? || !!clean_value.to_i64?(prefix: true)
+    end
   end
 end