Overwrite Cursor's `Seek::stream_{len, position}` for performance
Overwrite Cursor's `Seek::stream_{len, position}` for performance

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust