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ISC DHCP support a lot of duplications in config file, e.g. from Dan's sample:

• multiple class definitions (note the ISC DHCP parser merges definitions with the same class name so the MA does the same as it shares this code)
• multiple option definitions
• multiple host (aka reservation) definitions sharing the same address

The last two are IMHO errors so I commented them out. In conclusion the problem is more on the ISC DHCP side and to accept less duplication in Kea is both right and should be spread.