JsonElement's content is not escaped

[sandwwraith]

Describe the bug

While JsonElement.toString() produces string with escaped double-quote character,
JsonElement.content.toString() produces unescaped and unquoted string

To Reproduce

val secret = """338="}ha2"""
val j = json {
    "secret" to JsonLiteral(secret)
}
println(j["secret"]) // "338=\"}ha2"
println(j["secret"]?.content) // 338="}ha2

Expected behavior

Special characters (") are escaped in JsonLiteral constructor.

Other possible solutions: discourage work with .content.

It is unclear whether .content should be quoted.

Environment

• Kotlin version: 1.3.70
• Library version: 0.20.0
• Kotlin platforms: all