At some point in the future we will probably discontinue support for old Kad1 packets (replaced with Kad2 since about a year) in order to reduce code complexity, make it easier to maintain and reduce compability related overhead. This will not happen in the next version (the one after 0.48a), but should be expected any version afterwards.
If you are writing a Kad implementation, make sure to not base it on Kad1 but Kad2.
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