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      "file": "faults/wig1_short.wig1",
      "format": "WIG1",
      "about": "three bytes, shorter than a magic",
      "code": "bad_magic"
    },
    {
      "name": "wig1_magic",
      "file": "faults/wig1_magic.wig1",
      "format": "WIG1",
      "about": "the magic WIGX",
      "code": "bad_magic"
    },
    {
      "name": "wig1_level_as_field",
      "file": "faults/wig1_level_as_field.wig1",
      "format": "WIG1",
      "about": "a WIL1 level offered as a field",
      "code": "format_capability_mismatch"
    },
    {
      "name": "wig1_no_version",
      "file": "faults/wig1_no_version.wig1",
      "format": "WIG1",
      "about": "the magic alone",
      "code": "stream_length"
    },
    {
      "name": "wig1_version_2",
      "file": "faults/wig1_version_2.wig1",
      "format": "WIG1",
      "about": "version 2",
      "code": "version"
    },
    {
      "name": "wig1_fixed_cut",
      "file": "faults/wig1_fixed_cut.wig1",
      "format": "WIG1",
      "about": "fifteen bytes: the fixed header cut short",
      "code": "stream_length"
    },
    {
      "name": "wig1_header_cut",
      "file": "faults/wig1_header_cut.wig1",
      "format": "WIG1",
      "about": "the view record cut short by one byte",
      "code": "stream_length"
    },
    {
      "name": "wig1_reserved",
      "file": "faults/wig1_reserved.wig1",
      "format": "WIG1",
      "about": "the header's reserved field 1",
      "code": "reserved_nonzero"
    },
    {
      "name": "wig1_view_reserved",
      "file": "faults/wig1_view_reserved.wig1",
      "format": "WIG1",
      "about": "the view record's reserved byte 1",
      "code": "reserved_nonzero"
    },
    {
      "name": "wig1_levels_0",
      "file": "faults/wig1_levels_0.wig1",
      "format": "WIG1",
      "about": "L 0",
      "code": "field_range"
    },
    {
      "name": "wig1_levels_17",
      "file": "faults/wig1_levels_17.wig1",
      "format": "WIG1",
      "about": "L 17",
      "code": "field_range"
    },
    {
      "name": "wig1_carried_0",
      "file": "faults/wig1_carried_0.wig1",
      "format": "WIG1",
      "about": "K 0",
      "code": "field_range"
    },
    {
      "name": "wig1_carried_past",
      "file": "faults/wig1_carried_past.wig1",
      "format": "WIG1",
      "about": "K one more than L",
      "code": "field_range"
    },
    {
      "name": "wig1_features_0",
      "file": "faults/wig1_features_0.wig1",
      "format": "WIG1",
      "about": "F 0",
      "code": "field_range"
    },
    {
      "name": "wig1_features_9",
      "file": "faults/wig1_features_9.wig1",
      "format": "WIG1",
      "about": "F 9",
      "code": "field_range"
    },
    {
      "name": "wig1_table_3",
      "file": "faults/wig1_table_3.wig1",
      "format": "WIG1",
      "about": "T 3",
      "code": "field_range"
    },
    {
      "name": "wig1_table_20",
      "file": "faults/wig1_table_20.wig1",
      "format": "WIG1",
      "about": "T 20",
      "code": "field_range"
    },
    {
      "name": "wig1_ffrac_7",
      "file": "faults/wig1_ffrac_7.wig1",
      "format": "WIG1",
      "about": "ffrac 7",
      "code": "field_range"
    },
    {
      "name": "wig1_ffrac_17",
      "file": "faults/wig1_ffrac_17.wig1",
      "format": "WIG1",
      "about": "ffrac 17",
      "code": "field_range"
    },
    {
      "name": "wig1_wfrac_16",
      "file": "faults/wig1_wfrac_16.wig1",
      "format": "WIG1",
      "about": "wfrac 16",
      "code": "field_range"
    },
    {
      "name": "wig1_layers_0",
      "file": "faults/wig1_layers_0.wig1",
      "format": "WIG1",
      "about": "N 0",
      "code": "field_range"
    },
    {
      "name": "wig1_layers_9",
      "file": "faults/wig1_layers_9.wig1",
      "format": "WIG1",
      "about": "N 9",
      "code": "field_range"
    },
    {
      "name": "wig1_side_0",
      "file": "faults/wig1_side_0.wig1",
      "format": "WIG1",
      "about": "a level of side 0",
      "code": "field_range"
    },
    {
      "name": "wig1_sides_repeat",
      "file": "faults/wig1_sides_repeat.wig1",
      "format": "WIG1",
      "about": "two levels of one side",
      "code": "field_range"
    },
    {
      "name": "wig1_width_0",
      "file": "faults/wig1_width_0.wig1",
      "format": "WIG1",
      "about": "a hidden layer of width 0",
      "code": "field_range"
    },
    {
      "name": "wig1_width_257",
      "file": "faults/wig1_width_257.wig1",
      "format": "WIG1",
      "about": "a hidden layer of width 257",
      "code": "field_range"
    },
    {
      "name": "wig1_level_count",
      "file": "faults/wig1_level_count.wig1",
      "format": "WIG1",
      "about": "one level more than the network reads: L + 1 sides and an input width of L · F",
      "code": "field_range"
    },
    {
      "name": "wig1_input_width",
      "file": "faults/wig1_input_width.wig1",
      "format": "WIG1",
      "about": "an input width one more than L · F",
      "code": "field_range"
    },
    {
      "name": "wig1_last_width_3",
      "file": "faults/wig1_last_width_3.wig1",
      "format": "WIG1",
      "about": "a last layer of width 3",
      "code": "field_range"
    },
    {
      "name": "wig1_view_coord",
      "file": "faults/wig1_view_coord.wig1",
      "format": "WIG1",
      "about": "an eye coordinate of 2^24 + 1",
      "code": "field_range"
    },
    {
      "name": "wig1_view_focal_0",
      "file": "faults/wig1_view_focal_0.wig1",
      "format": "WIG1",
      "about": "a focal length of 0",
      "code": "field_range"
    },
    {
      "name": "wig1_view_width_0",
      "file": "faults/wig1_view_width_0.wig1",
      "format": "WIG1",
      "about": "a view of width 0",
      "code": "field_range"
    },
    {
      "name": "wig1_view_height_1025",
      "file": "faults/wig1_view_height_1025.wig1",
      "format": "WIG1",
      "about": "a view of height 1025",
      "code": "field_range"
    },
    {
      "name": "wig1_view_steps_0",
      "file": "faults/wig1_view_steps_0.wig1",
      "format": "WIG1",
      "about": "a view of no samples",
      "code": "field_range"
    },
    {
      "name": "wig1_view_near_negative",
      "file": "faults/wig1_view_near_negative.wig1",
      "format": "WIG1",
      "about": "t_near −1",
      "code": "field_range"
    },
    {
      "name": "wig1_view_far_not_past",
      "file": "faults/wig1_view_far_not_past.wig1",
      "format": "WIG1",
      "about": "t_far equal to t_near",
      "code": "field_range"
    },
    {
      "name": "wig1_view_far_past_cap",
      "file": "faults/wig1_view_far_past_cap.wig1",
      "format": "WIG1",
      "about": "t_far 2^22 + 1",
      "code": "field_range"
    },
    {
      "name": "wig1_view_degenerate",
      "file": "faults/wig1_view_degenerate.wig1",
      "format": "WIG1",
      "about": "an up direction along the forward one",
      "code": "field_range"
    },
    {
      "name": "wig1_network_too_large",
      "file": "faults/wig1_network_too_large.wig1",
      "format": "WIG1",
      "about": "hidden layers of 256: more than 2^16 multiply-accumulates a point",
      "code": "too_large"
    },
    {
      "name": "wig1_weights_cut",
      "file": "faults/wig1_weights_cut.wig1",
      "format": "WIG1",
      "about": "the first layer's weights cut short",
      "code": "stream_length"
    },
    {
      "name": "wig1_level_cut",
      "file": "faults/wig1_level_cut.wig1",
      "format": "WIG1",
      "about": "the last level carried cut short by one byte",
      "code": "stream_length"
    },
    {
      "name": "wig1_trailing",
      "file": "faults/wig1_trailing.wig1",
      "format": "WIG1",
      "about": "one byte after the last level",
      "code": "trailing"
    },
    {
      "name": "wil1_short",
      "file": "faults/wil1_short.wil1",
      "format": "WIL1",
      "about": "three bytes, shorter than a magic",
      "code": "bad_magic"
    },
    {
      "name": "wil1_magic",
      "file": "faults/wil1_magic.wil1",
      "format": "WIL1",
      "about": "the magic WILX",
      "code": "bad_magic"
    },
    {
      "name": "wil1_field_as_level",
      "file": "faults/wil1_field_as_level.wil1",
      "format": "WIL1",
      "about": "a WIG1 field offered as a level",
      "code": "format_capability_mismatch"
    },
    {
      "name": "wil1_no_version",
      "file": "faults/wil1_no_version.wil1",
      "format": "WIL1",
      "about": "the magic alone",
      "code": "stream_length"
    },
    {
      "name": "wil1_version_2",
      "file": "faults/wil1_version_2.wil1",
      "format": "WIL1",
      "about": "version 2",
      "code": "version"
    },
    {
      "name": "wil1_header_cut",
      "file": "faults/wil1_header_cut.wil1",
      "format": "WIL1",
      "about": "eleven bytes: the header cut short",
      "code": "stream_length"
    },
    {
      "name": "wil1_reserved",
      "file": "faults/wil1_reserved.wil1",
      "format": "WIL1",
      "about": "the header's reserved field 1",
      "code": "reserved_nonzero"
    },
    {
      "name": "wil1_index_0",
      "file": "faults/wil1_index_0.wil1",
      "format": "WIL1",
      "about": "level index 0, which a WIG1 always carries",
      "code": "field_range"
    },
    {
      "name": "wil1_index_16",
      "file": "faults/wil1_index_16.wil1",
      "format": "WIL1",
      "about": "level index 16",
      "code": "field_range"
    },
    {
      "name": "wil1_features_0",
      "file": "faults/wil1_features_0.wil1",
      "format": "WIL1",
      "about": "F 0",
      "code": "field_range"
    },
    {
      "name": "wil1_table_20",
      "file": "faults/wil1_table_20.wil1",
      "format": "WIL1",
      "about": "T 20",
      "code": "field_range"
    },
    {
      "name": "wil1_side_0",
      "file": "faults/wil1_side_0.wil1",
      "format": "WIL1",
      "about": "side 0",
      "code": "field_range"
    },
    {
      "name": "wil1_table_cut",
      "file": "faults/wil1_table_cut.wil1",
      "format": "WIL1",
      "about": "the level's table cut short by one byte",
      "code": "stream_length"
    },
    {
      "name": "wil1_larger_table",
      "file": "faults/wil1_larger_table.wil1",
      "format": "WIL1",
      "about": "a table size twice the one carried: the table is cut short",
      "code": "stream_length"
    },
    {
      "name": "wil1_smaller_side",
      "file": "faults/wil1_smaller_side.wil1",
      "format": "WIL1",
      "about": "a side of 3: fewer entries than the table carried",
      "code": "trailing"
    },
    {
      "name": "wil1_trailing",
      "file": "faults/wil1_trailing.wil1",
      "format": "WIL1",
      "about": "one byte after the table",
      "code": "trailing"
    }
  ],
  "geometry": [
    {
      "name": "in_order",
      "about": "levels 2 and 3 applied in order",
      "base": "scenes/orb.wig1",
      "apply": [
        "scenes/orb.l2.wil1",
        "scenes/orb.l3.wil1"
      ],
      "expect": [
        "ok",
        "ok"
      ]
    },
    {
      "name": "skip_level",
      "about": "level 3 applied to a field holding levels 0 and 1",
      "base": "scenes/orb.wig1",
      "apply": [
        "scenes/orb.l3.wil1"
      ],
      "expect": [
        "geometry_mismatch"
      ]
    },
    {
      "name": "reverse",
      "about": "level 3, then level 2, then level 3: the first is out of order",
      "base": "scenes/orb.wig1",
      "apply": [
        "scenes/orb.l3.wil1",
        "scenes/orb.l2.wil1",
        "scenes/orb.l3.wil1"
      ],
      "expect": [
        "geometry_mismatch",
        "ok",
        "ok"
      ]
    },
    {
      "name": "repeat",
      "about": "level 2 applied twice",
      "base": "scenes/orb.wig1",
      "apply": [
        "scenes/orb.l2.wil1",
        "scenes/orb.l2.wil1"
      ],
      "expect": [
        "ok",
        "geometry_mismatch"
      ]
    },
    {
      "name": "side",
      "about": "level 2 with a side one more than the field declares for it",
      "base": "scenes/orb.wig1",
      "apply": [
        "faults/geometry_side.wil1"
      ],
      "expect": [
        "geometry_mismatch"
      ]
    },
    {
      "name": "features",
      "about": "level 2 with one feature fewer than the field's",
      "base": "scenes/orb.wig1",
      "apply": [
        "faults/geometry_features.wil1"
      ],
      "expect": [
        "geometry_mismatch"
      ]
    },
    {
      "name": "table",
      "about": "level 2 with a table half the field's",
      "base": "scenes/orb.wig1",
      "apply": [
        "faults/geometry_table.wil1"
      ],
      "expect": [
        "geometry_mismatch"
      ]
    },
    {
      "name": "past_levels",
      "about": "a fifth level of a field that declares four, holding all four",
      "base": "scenes/orb.wig1",
      "apply": [
        "scenes/orb.l2.wil1",
        "scenes/orb.l3.wil1",
        "faults/geometry_past.wil1"
      ],
      "expect": [
        "ok",
        "ok",
        "geometry_mismatch"
      ]
    }
  ],
  "staged": [
    {
      "name": "in_order",
      "about": "the levels in order",
      "base": "staged/orb.base.wai",
      "offers": [
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "stage": 1
          }
        },
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "stage": 2
          }
        }
      ],
      "final": {
        "stage": 2,
        "frozen": false,
        "stage_sha256": "b313bd0d1038e1aada44c0d699be559795e8aa440843a17c5e98ba662929d067"
      }
    },
    {
      "name": "out_of_order",
      "about": "level 3 first: discarded on arrival with a hold bound of zero (layer-gap), then both in order",
      "base": "staged/orb.base.wai",
      "offers": [
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "reason": "layer-gap"
          }
        },
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "stage": 1
          }
        },
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "stage": 2
          }
        }
      ],
      "final": {
        "stage": 2,
        "frozen": false,
        "stage_sha256": "b313bd0d1038e1aada44c0d699be559795e8aa440843a17c5e98ba662929d067"
      }
    },
    {
      "name": "refusals",
      "about": "a layer refused at each envelope step, then level 2, level 3 with the wrong producer, level 2 again, and level 3",
      "base": "staged/orb.base.wai",
      "offers": [
        {
          "file": "staged/orb.l2_no_refines.wai",
          "expect": {
            "reason": "refines-malformed"
          }
        },
        {
          "file": "staged/orb.l2_not_refinement.wai",
          "expect": {
            "reason": "capability-not-refinement"
          }
        },
        {
          "file": "staged/orb.l2_fallback.wai",
          "expect": {
            "reason": "capability-not-refinement"
          }
        },
        {
          "file": "staged/orb.l2_other_base.wai",
          "expect": {
            "reason": "base-absent"
          }
        },
        {
          "file": "staged/orb.l2_span_past.wai",
          "expect": {
            "reason": "refines-malformed"
          }
        },
        {
          "file": "staged/orb.l2_splat_refine.wai",
          "expect": {
            "reason": "base-not-admitted"
          }
        },
        {
          "file": "staged/orb.l2_trailing.wai",
          "expect": {
            "reason": "payload-malformed",
            "detail": "trailing"
          }
        },
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "stage": 1
          }
        },
        {
          "file": "staged/orb.l3_wrong_prev.wai",
          "expect": {
            "reason": "prev-mismatch"
          }
        },
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "reason": "prev-mismatch"
          }
        },
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "stage": 2
          }
        }
      ],
      "final": {
        "stage": 2,
        "frozen": false,
        "stage_sha256": "b313bd0d1038e1aada44c0d699be559795e8aa440843a17c5e98ba662929d067"
      }
    },
    {
      "name": "conflict",
      "about": "a second, different layer 1 after level 2: the unit is frozen and level 3 is not applied",
      "base": "staged/orb.base.wai",
      "offers": [
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "stage": 1
          }
        },
        {
          "file": "staged/orb.l2_alt.wai",
          "expect": {
            "reason": "layer-conflict"
          }
        },
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "reason": "layer-conflict"
          }
        }
      ],
      "final": {
        "stage": 1,
        "frozen": true,
        "stage_sha256": "d1bb8e89a1407ce9898f9dda29dedac81656842d3b02f4de561867503680dafa"
      }
    },
    {
      "name": "geometry_then_conflict",
      "about": "a layer 1 carrying level 3 passes step 8 and fails step 9; the true level 2 then conflicts with it",
      "base": "staged/orb.base.wai",
      "offers": [
        {
          "file": "staged/orb.l2_carrying_l3.wai",
          "expect": {
            "reason": "geometry-mismatch",
            "detail": "geometry_mismatch"
          }
        },
        {
          "file": "staged/orb.l2.wai",
          "expect": {
            "reason": "layer-conflict"
          }
        },
        {
          "file": "staged/orb.l3.wai",
          "expect": {
            "reason": "layer-conflict"
          }
        }
      ],
      "final": {
        "stage": 0,
        "frozen": true,
        "stage_sha256": "24a7fc2b00a8b4f2832bc8e637800296212f35be872d6c768d359bcc92142d6b"
      }
    }
  ]
}