docs: update internals.md

Author: kenjis

contributing/internals.md

@@ -29,10 +29,9 @@ PHP7 provides [Type declarations](https://www.php.net/manual/en/language.types.d
 for method parameters and return types. Use it where possible. Return type
 declaration is not always practical, but do try to make it work.
 
-At this time, shipped CI4 production code does not use 
-[Strict typing](https://www.php.net/manual/en/language.types.declarations.php#language.types.declarations.strict), 
-and will not be any time soon. However, in the development phase, 
-there are internal classes (in `utils/`) that are strictly typed.
+At this time, shipped CI4 production code does use
+[Strict typing](https://www.php.net/manual/en/language.types.declarations.php#language.types.declarations.strict)
+as much as possible.
 
 ## Abstractions