Duplicate errors reported

[akbyrd]

In some cases when a file doesn't validate against the schema duplicate errors are emitted for each key in the table, rather than only the key the failed to validate.

In this image foo and bar are valid keys and additionalProperties is set to false in the schema. baz is not allowed and should therefore be an error. However errors also how up on baz and the first instance of test

This can get particularly bad when a small error in one location propagate up a large chain of tables. It can lead to hundreds of errors.

I used this schema and file to reproduce

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "test": {
      "type": "object",
      "properties": {
        "foo": {
          "type": "boolean"
        },
        "bar": {
          "type": "boolean"
        }
      },
      "additionalProperties": false
    }
  }
}

#: schema test.json

test.foo = true
test.bar = true
test.baz = true

[ia0]

I've also been experiencing this. That's pretty old, but I don't think there has ever been an issue for it. So let's use this one to track that issue.

I don't think this will ever get fixed without someone really looking into how Taplo works. Fixing this correctly would probably need some refactoring.