Result.Exists() has incorrect CMP and probably returns incorrect result

In source code

// Exists returns true if value exists.
//
//  if gjson.Get(json, "name.last").Exists(){
//		println("value exists")
//  }
func (t Result) Exists() bool {
	return t.Type != Null || len(t.Raw) != 0
}

The OR operator should probably be AND. Otherwise cmp with Null doesn't add any logic.

The expression can be written as

func (t Result) Exists() bool {
	return t.Raw !="null" || len(t.Raw) != 0
}

where len(t.Raw) != 0 is also true for t.Raw =="null", so first check does nothing

However, if op will be AND, the condition will be false for nulls and missing values.

I don't know which behaviour is supposed to be here, but to make code cleaner, one of these should be used

• return len(t.Raw) != 0 or
• return t.Type != Null && len(t.Raw) != 0

Start at the Result.Exists method shown in the issue and inspect how Result.Type, Result.Raw, Null, and missing values are represented elsewhere in the source. Determine the intended behavior for null and missing results, then update the condition and add or adjust coverage if existing tests exercise Exists.