fun String.toByteOrNull(): Byte?
Parses the string as a signed Byte number and returns the result or null
if the string is not a valid representation of a number.
fun String.toByteOrNull(radix: Int): Byte?
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/to-byte-or-null.html