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14.22.2: DynDS do not get date from cache on eval
14.21.2 : dyn_attr(): catch exceptions per attribute, do not allow NoneType
14.21.0 fix fn.isSequence(DynamicAttribute(int)) bug
14.20.3 fix bug in check_changed_events call (repeated values)
14.20.2 new functional methods (peak,unpack,...)
14.20.1 DynamicDS: call subclass.dyn_attr() by default
14.20.0 tracing to dynamic-push, added get_fqdn_name and set_attribute_value methods; solved bug on get_matching_device_attribute_labels
14.19.7: rethrown exceptions for XATTR(...,full=True), QATTR and WATTR
14.19.6: rethrown exceptions for XATTR(...,full=True) and QATTR
14.19.5: enforce update of DynamicDSTypes and locals prior to evaluation