Don't mess with `_before_type_cast` for numeric types

activerecord/lib/active_record/connection_adapters/postgresql/oid/float.rb

@@ -5,9 +5,8 @@ module OID # :nodoc:
         class Float < Type::Float
           include Infinity
 
-          def type_cast(value)
+          def cast_value(value)
             case value
-            when nil then         nil
             when 'Infinity' then  ::Float::INFINITY
             when '-Infinity' then -::Float::INFINITY
             when 'NaN' then       ::Float::NAN

activerecord/lib/active_record/type/numeric.rb

@@ -5,13 +5,14 @@ def number?
         true
       end
 
-      def type_cast_for_write(value)
-        case value
+      def type_cast(value)
+        value = case value
                 when true then 1
                 when false then 0
                 when ::String then value.presence
-        else super
+                else value
                 end
+        super(value)
       end
 
       def changed?(old_value, new_value) # :nodoc: