Improve error messge when number range constraint fails.

[sangee2004]

 cat schema.acorn 
{
    "items": [
        {
           aPositionNumber: number > 0
	   anExplicitConstant: string == "value"
	   aRegex: string =~ "str.*"
           aNumberRange: number > 0 && number < 10 || default 1
           defaultedString: "hi"
        }
    ]
}

items: [{aPositionNumber: 1
         anExplicitConstant: "value"
         aRegex: "stripe"
         aNumberRange: 10
         defaultedString: "hello"
        }
]

Following are error messages presented when aNumberRange is set as 11 ,0, 10

 aml eval --schema-file schema.acorn file.acorn 
2023/10/03 15:07:07 schema violation items.0.aNumberRange: option 1: [must match alternate],
option 2: [unmatched constraint 11 < 10],
option 3: [unmatched constraint 11 == 1]

% aml eval --schema-file schema.acorn file.acorn 
2023/10/03 15:08:21 schema violation items.0.aNumberRange: option 1: [must match alternate],
option 2: [unmatched constraint 0 > 0],
option 3: [unmatched constraint 0 == 1]

 % aml eval --schema-file schema.acorn file.acorn 
2023/10/03 15:09:00 schema violation items.0.aNumberRange: option 1: [must match alternate],
option 2: [unmatched constraint 10 < 10],
option 3: [unmatched constraint 10 == 1]

What is "must match alternate" mean here?