isDefined
Platform and version requirements: JVM (1.0), JS (1.5)
fun Char.isDefined(): Boolean
Returns true if this character (Unicode code point) is defined in Unicode.
A character is considered to be defined in Unicode if its category is not CharCategory.UNASSIGNED.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/is-defined.html
