Gabble's implementation of the Requests draft is not spec-compliant: it silently accepts unrecognised properties, which the spec says it MUST reject without side-effects. GabbleChannelManager needs some convenience API to check for unknown properties in a request, ideally re-using the same const gchar * const * that foreach_channel_class needs already. All the channel factories need to use it.
Fixed in 0.7.9 by wjt
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