Tuple validation, required elements in tuple

[bali182]

https://json-schema.org/understanding-json-schema/reference/array.html#tuple-validation

The example for tuple validation demonstrates it using this sample:

{
  "type": "array",
  "prefixItems": [
    { "type": "number" },
    { "type": "string" },
    { "enum": ["Street", "Avenue", "Boulevard"] },
    { "enum": ["NW", "NE", "SW", "SE"] }
  ]
}

And then says the following input is valid:

[10, "Downing", "Street"]

Since I don't see any distinguishing factor between the last schema item ({ "enum": ["NW", "NE", "SW", "SE"] }) and the rest, does this mean all the following are valid?

[1, "str"]

[1]

[]

If so how would I express a schema identical to this, except it MUST havel all 4 items, meaning neither of them is optional?

[Relequestual]

You are correct.
You must use minItems: http://json-schema.org/understanding-json-schema/reference/array.html#length

[bali182]

Understood, thanks!