tasks.patch({ id: '1' }).data((attrs, ops) => {
  ops.set(attrs.map['hello world'], 1)
  ops.set(attrs.map['hello    world'], 1)
}).go()

{
    "UpdateExpression": "SET #map.#helloworld = :map_u0, #map.#helloworld = :map_u1, #id = :id_u0, #__edb_e__ = :__edb_e___u0, #__edb_v__ = :__edb_v___u0",
    "ExpressionAttributeNames": {
        "#pk": "pk",
        "#sk": "sk",
        "#map": "map",
        "#helloworld": "hello    world", // only 1 expression attribute name was generated because both keys ('hello world' and 'hello    world') are equal after removing non-word characters
        "#id": "id",
        "#__edb_e__": "__edb_e__",
        "#__edb_v__": "__edb_v__"
    },
    "ExpressionAttributeValues": {
        ":map_u0": 1,
        ":map_u1": 1,
        ":id_u0": "1",
        ":__edb_e___u0": "tasks",
        ":__edb_v___u0": "1"
    },
    "TableName": "your_table_name",
    "Key": {
        "pk": "$taskapp#id_1",
        "sk": "$tasks_1"
    },
    "ConditionExpression": "attribute_exists(#pk) AND attribute_exists(#sk)"
}

Error thrown by DynamoDB client: \"Invalid UpdateExpression: Two document paths overlap with each other; must remove or rewrite one of these paths...

{
  model: {
    entity: "tasks",
    version: "1",
    service: "taskapp"
  },
  attributes: {
    id: {
      type: "string",
      required: true
    },
    map: {
      type: 'any'
    },
  },
  indexes: {
    projects: {
      pk: {
        field: "pk",
        composite: ["id"]
      },
      sk: {
        field: "sk",
        composite: []
      }
    },
  }
}

Error thrown by DynamoDB client: \"Invalid UpdateExpression: Two document paths overlap with each other; must remove or rewrite one of these paths...