The Amazing Hanna

Hi! I'm building an application that contains a large number of text documents. It's a wiki style site where users can add documentation. I thought I'd use the textarea field (with CKEditor), but it seems like the Sanitizer class automatically truncates any value to a maximum of 16384 characters. I'd like to increase this a bit as it seems possible that text documents could well be longer than this. Is there any way to change the limit without making a custom fieldtype or directly changing the Sanitizer class? If I make a custom fieldtype, how would I go about increasing the Sanitizer limit?