c_g_param_spec_uint

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GParamSpec* function(gchar* name, gchar* nick, gchar* blurb, guint minimum, guint maximum, guint defaultValue, GParamFlags flags) c_g_param_spec_uint;

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