createLinearNumericIdGenerator()

Creates a function that generates unique strings based on call order.

Example:

generateLinearNumericId = createLinearNumericIdGenerator(6);
generateLinearNumericId() // '000000'
generateLinearNumericId() // '000001'
...
generateLinearNumericId() // '999999'
generateLinearNumericId() // '1000000'
...
generateLinearNumericId() // '9999999'
generateLinearNumericId() // '10000000'