PRESENT

import kotlin.io.encoding.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val format = HexFormat { upperCase = true; bytes.byteSeparator = " " }
val bytes = byteArrayOf(0xDE.toByte(), 0x2D, 0x02, 0xC0.toByte())

// The predefined Base64 instances are configured with PaddingOption.PRESENT.
// Hence, the same instance is returned.
val isSameInstance = Base64.Default.withPadding(Base64.PaddingOption.PRESENT) === Base64.Default
println("isSameInstance is ${isSameInstance}") // true

// PaddingOption.PRESENT pads on encode, and requires padded input on decode
println(Base64.Default.encode(bytes)) // 3i0CwA==
println(Base64.Default.decode("3i0CwA==").toHexString(format)) // DE 2D 02 C0
// PaddingOption.PRESENT requires the decode input to be properly padded
// Base64.Default.decode("3i0CwA") // will fail with IllegalArgumentException 
   //sampleEnd
}