Function make_custom_readers 

pub fn make_custom_readers() -> HashMap<String, Arc<dyn for<'a, 'dep> Fn(&'a Bump, &'a UserDefinedType, &'a [UserDefinedType], &'dep HashMap<u64, Value<'a>>, &'a [u8]) -> Result<Value<'a>, Error>>>

Dictionnary of custom readers for dynamically sized events