WpSpaPod objects with unknown keys warn on parse

Attempting to iterate over an ALSA node's params like for param in node:iterate_params("Props") do param:parse() end results in the following warning:

C 14:05:42.610431         wp-spa-pod (null):(null):(null): wp_spa_pod_get_property: assertion 'key_val != NULL' failed
W 14:05:42.610441    m-lua-scripting (null):(null):(null): (../modules/module-lua-scripting/pod.c:1056):push_luapod: runtime check failed: (wp_spa_pod_get_property (prop, &key, &val))

Log.info(param) says...

I 14:05:42.610402 script/static-link static-link.lua:77:chunk: <WpSpaPod:0xfd7ac0> node prop:
  Object: size 496, type Spa:Pod:Object:Param:Props (262146), id Spa:Enum:ParamId:Props (2)
    Prop: key Spa:Pod:Object:Param:Props:device (257), flags 00000000
      String "hw:Generic"
    Prop: key Spa:Pod:Object:Param:Props:deviceName (258), flags 00000000
      String ""
    Prop: key Spa:Pod:Object:Param:Props:cardName (261), flags 00000000
      String ""
    Prop: key Spa:Pod:Object:Param:Props:minLatency (262), flags 00000000
      Int 16
    Prop: key Spa:Pod:Object:Param:Props:maxLatency (263), flags 00000000
      Int 8192
    Prop: key unknown (16777216), flags 00000000
      Bool false
    Prop: key Spa:Pod:Object:Param:Props:latencyOffsetNsec (65550), flags 00000000
      Long 0

pw-dump serializes it like so:

          {
            "device": "hw:Generic",
            "deviceName": "",
            "cardName": "",
            "minLatency": 16,
            "maxLatency": 8192,
            "id-01000000": false,
            "latencyOffsetNsec": 0
          }

Also in PropInfo:

          {
            "id": "id-01000000",
            "name": "Use the driver channelmap",
            "type": false
          }

would it make sense to support this as a { [numerickey] = false } or something?