Method peek

crates/vm/src/stdlib/_io.rs:1869–1878

(&self, _size: OptionalSize, vm: &VirtualMachine)

        #[pymethod]
        fn peek(&self, _size: OptionalSize, vm: &VirtualMachine) -> PyResult<Vec<u8>> {
            let mut data = self.reader().lock(vm)?;
            let raw = data.check_init(vm)?;
            ensure_unclosed(raw, "peek of closed file", vm)?;

            if data.writable() {
                let _ = data.flush_rewind(vm);
            }
            data.peek(vm)
        }

        #[pymethod]
        fn read1(&self, size: OptionalSize, vm: &VirtualMachine) -> PyResult<Vec<u8>> {