decrypt_max_plaintext_length
actual fun decrypt_max_plaintext_length(session: OlmSessionPointer, messageType: ULong, message: ByteArray): ULong
actual fun decrypt_max_plaintext_length(session: OlmSessionPointer, messageType: ULong, message: ByteArray): ULong
expect fun decrypt_max_plaintext_length(session: OlmSessionPointer, messageType: ULong, message: ByteArray): ULong