BREADTH_FIRST
Platform and version requirements: JVM (1.0), JRE7 (1.0)
BREADTH_FIRSTWalks in breadth-first order.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io.path/-path-walk-option/-b-r-e-a-d-t-h_-f-i-r-s-t.html