Don't most of those end up JIT'd into native binary code, anyhow? The compiler would output code into a W page, then flip it to an X page and jump in. If it's

Don't most of those end up JIT'd into native binary code, anyhow? The compiler would output code into a W page, then flip it to an X page and jump in. If it's just an interpreter, then the "sort-of executable" is just data being read, and the page can stay write-only.