When doing a visual selection in a file and trying to write it to disk (via pressing ":" (this inserts the range) and then " w /tmp/file"), the whole source file is written with a name of "/tmp/file<range>", eg as "/tmp/font.ttf0x16a76,0x1b0b5". Furthermore, with the cursor on the last byte "x" in normal mode doesn't delete the byte; similarly, a visual range including the last byte doesn't accept "x" to delete this range.