DUK_DEFPROP_SET_WEC

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.

extern (C)

enum DUK_DEFPROP_SET_WEC = DUK_DEFPROP_SET_WRITABLE | DUK_DEFPROP_SET_ENUMERABLE | DUK_DEFPROP_SET_CONFIGURABLE;