Missing json validation on parsing with intermediate JsonObject representation

[kunyavskiy]

Describe the bug

Long values are not validated to be actual longs when parsed from JsonObject

To Reproduce

import kotlinx.serialization.json.*
import kotlinx.serialization.*

@Serializable
data class A(val a: Long)

fun main() {
    val str = """{"a":"12:34:45"}"""
    println(Json.decodeFromJsonElement<A>(Json.decodeFromString<JsonObject>(str)))
    println(Json.decodeFromString<A>(str))
}

Expected behavior

Both crash with SerializationException.
Actually first prints A(a=12), while second one crashes. Btw, the error message in the second one is really misleading.

Environment

• Kotlin version: 2.0.20
• Library version: 1.7.3
• Kotlin platforms: JVM

[sandwwraith]

Another incorrect input for the same snippet: """{"a": "3 digit then random string"}"""
From #2656

[sandwwraith]

Related issues with JsonLiteral: #2511 #2375 #1298