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The Firebase Kotlin SDK is a Kotlin-first SDK for Firebase. It's API is similar to the Firebase Android SDK Kotlin Extensions but also supports multiplatform projects, enabling you to use Firebase directly from your common source targeting iOS, Android or JS.

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package dev.gitlive.firebase.firestore.internal

import dev.gitlive.firebase.firestore.DocumentReference
import dev.gitlive.firebase.firestore.GeoPoint
import dev.gitlive.firebase.firestore.Timestamp

internal val Any.safeValue: Any get() = when (this) {
    is Timestamp -> nativeValue
    is GeoPoint -> nativeValue
    is DocumentReference -> native.nativeValue
    is Map<*, *> -> this.mapNotNull { (key, value) -> key?.let { it.safeValue to value?.safeValue } }
    is Collection<*> -> this.mapNotNull { it?.safeValue }
    else -> this
}