libao pulse plugin does not ignore unsupported options as claimed

[Ryan C. Underwood]

In the documentation for ao_open_live():
https://xiph.org/ao/doc/ao_open_live.html
"Unsupported options are ignored."

However, the pulse plugin does not ignore unsupported options:

int ao_plugin_set_option(ao_device *device, const char *key, const char *value) {
  ao_pulse_internal *internal;
  assert(device && device->internal && key && value);
  internal = (ao_pulse_internal *) device->internal;

  if (!strcmp(key, "server")) {
    free(internal->server);
    internal->server = strdup(value);
  } else if (!strcmp(key, "sink") || !strcmp(key, "dev") || !strcmp(key, "id")) {
    free(internal->sink);
    internal->sink = strdup(value);
  } else
    return 0;
[..]
}

Passing the "buffer_time" option which is needed because of this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1193688
causes libao pulse to fail initialization on Ubuntu contrary to the documentation.