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mod-synth-records defaults are not applied

When values for ttl or prefix are not specified in the mod-synth-record section of knot.conf, I'd expect the default values to be used from man knot.conf. Instead, knot logs errors about invalid parameters.

Example: ttl, manpage says defaults to 3600.

mod-synth-record:
  - id: forward
    type: forward
    network: 1234:5678:90ab:cdef::/64
    prefix: ""

Sep 29 20:50:12 agent knot[7903]: error: config, file '/etc/knot/knot.conf', line 10, mod-synth-record 'forward' (no ttl specified)

Example: prefix, manpage says defaults to empty.

mod-synth-record:
  - id: forward
    type: forward
    network: 1234:5678:90ab:cdef::/64
    ttl: 3600

Sep 29 20:52:11 agent knot[7937]: error: config, file '/etc/knot/knot.conf', line 10, mod-synth-record 'forward' (no owner prefix specified)

Specifying both parameters as their default value for every instance of mod-synth-record allows knot to start:

mod-synth-record:
  - id: forward
    type: forward
    network: 1234:5678:90ab:cdef::/64
    prefix: ""
    ttl: 3600

Knot version: 2.0.1-3+trusty+1 from ppa:cz.nic-labs/knot-dns

OS: Ubuntu Trusty 14.04 64-bit