pyld (current master) does not create typed containers

[satra]

in the example below, i'm trying to change the graph into an index by node type. but the current pyld processor doesn't appear to do so:

{
  "@context": [
    {
      "@version": 1.1,
      "schema": "https://schema.org/",
      "records": {
        "@id": "@graph",
        "@container": "@type"
      }
    },
    "https://openprovenance.org/prov.jsonld",
    {
      "pydra": "https://s.pydra.org/",
      "uuid": "pydra:uuid/",
      "task": {
        "@id": "prov:activity",
        "@type": "@vocab"
      },
      "monitor": {
        "@id": "prov:activity",
        "@type": "@vocab"
      },
      "runtime": {
        "@id": "prov:entity",
        "@type": "@vocab"
      },
      "prov:wasGeneratedBy": {
        "@id": "prov:wasGeneratedBy",
        "@type": "@vocab"
      },
      "rss_peak_gb": {
        "@id": "pydra:rss_peak_gb",
        "@type": "xsd:float"
      },
      "vms_peak_gb": {
        "@id": "pydra:vms_peak_gb",
        "@type": "xsd:float"
      },
      "cpu_peak_percent": {
        "@id": "pydra:cpu_peak_percent",
        "@type": "xsd:float"
      }
    }
  ],
  "@graph": [
    {
      "@id": "uuid:589d99d613484aba8c360b72b7c3415f",
      "@type": "activity",
      "endedAtTime": "2018-12-09T06:01:42.166760",
      "startedAtTime": "2018-12-09T06:01:41.926344"
    },
    {
      "@id": "uuid:6d86eec440344c8ebc5a84dd7230494b",
      "@type": "entity",
      "prov:wasGeneratedBy": "uuid:9b0f825246554e57a1646f647c3fec4c",
      "cpu_peak_percent": "1.017E2",
      "rss_peak_gb": "2.693176269531250E-02",
      "vms_peak_gb": "4.11656951953125E0"
    },
    {
      "@id": "uuid:9b0f825246554e57a1646f647c3fec4c",
      "@type": "activity",
      "endedAtTime": "2018-12-09T06:01:42.165476",
      "startedAtTime": "2018-12-09T06:01:42.151908"
    }
  ],
  "@id": "uuid:e64db211f6f8421989d32b2f99e93df0"
}

was expecting the output to look like:

...
  "records": {
    "activity": [
      {
        "@id": "uuid:589d99d613484aba8c360b72b7c3415f"
      "endedAtTime": "2018-12-09T06:01:42.166760",
      "startedAtTime": "2018-12-09T06:01:41.926344"
      },
      {
        "@id": "uuid:9b0f825246554e57a1646f647c3fec4c",
      "endedAtTime": "2018-12-09T06:01:42.165476",
      "startedAtTime": "2018-12-09T06:01:42.151908"
      }
    ],
    "entity": {
      "@id": "uuid:6d86eec440344c8ebc5a84dd7230494b",
      "cpu_peak_percent": "1.017E2",
      "rss_peak_gb": "2.693176269531250E-02",
      "vms_peak_gb": "4.11656951953125E0",
      "prov:wasGeneratedBy": "uuid:9b0f825246554e57a1646f647c3fec4c"
    }
  },
  "@id": "uuid:e64db211f6f8421989d32b2f99e93df0"