pub unsafe extern "C" fn duk_opt_context(
ctx: *mut duk_context,
idx: duk_idx_t,
def_value: *mut duk_context,
) -> *mut duk_contextpub unsafe extern "C" fn duk_opt_context(
ctx: *mut duk_context,
idx: duk_idx_t,
def_value: *mut duk_context,
) -> *mut duk_context