*** Formula: Map(Range(5), {A: it, B: "A" & ToText(it)})
*** Item DType: {A:i8, B:s}
"custom {A:i8, B:s} :: {\"A\":0,\"B\":\"A0\"}"
"custom {A:i8, B:s} :: {\"A\":1,\"B\":\"A1\"}"
"custom {A:i8, B:s} :: {\"A\":2,\"B\":\"A2\"}"
"custom {A:i8, B:s} :: {\"A\":3,\"B\":\"A3\"}"
"custom {A:i8, B:s} :: {\"A\":4,\"B\":\"A4\"}"

*** Formula: [{'lowercase': "value1", 'MixedCase': "value2",'UPPERCASE': "value3"}]
*** Item DType: {MixedCase:s, UPPERCASE:s, lowercase:s}
"custom {MixedCase:s, UPPERCASE:s, lowercase:s} :: {\"MixedCase\":\"value2\",\"UPPERCASE\":\"value3\",\"lowercase\":\"value1\"}"

*** Formula: [{TupleField: ("A", 1)}, {TupleField: ("B", 2)}]
*** Item DType: {TupleField:(s, i8)}
"custom {TupleField:(s, i8)} :: {\"TupleField\":[\"A\",1]}"
"custom {TupleField:(s, i8)} :: {\"TupleField\":[\"B\",2]}"

*** Formula: [({RecordInTuple: 1}, "A"), ({RecordInTuple: 2}, "B")]
*** Item DType: ({RecordInTuple:i8}, s)
"custom ({RecordInTuple:i8}, s) :: [{\"RecordInTuple\":1},\"A\"]"
"custom ({RecordInTuple:i8}, s) :: [{\"RecordInTuple\":2},\"B\"]"

*** Formula: [{RecordWithSequence: [1, 2]}, {RecordWithSequence: []}, {RecordWithSequence: null}]
*** Item DType: {RecordWithSequence:i8*}
"custom {RecordWithSequence:i8*} :: {\"RecordWithSequence\":[1,2]}"
"custom {RecordWithSequence:i8*} :: {\"RecordWithSequence\":[]}"
"custom {RecordWithSequence:i8*} :: {\"RecordWithSequence\":[]}"

*** Formula: [{ 'A"B': "hello" }]
*** Item DType: {'A"B':s}
"custom {'A\"B':s} :: {\"A\\\"B\":\"hello\"}"

*** Formula: [{ 'A\u0001B': "hello" }]
*** Item DType: {'A\u0001B':s}
"custom {'A\\u0001B':s} :: {\"A\\\\u0001B\":\"hello\"}"

