I prefer extensions over top-level functions because they are not suggested everywhere

# stdlib

[marcinmoskala]

I prefer extensions over top-level functions because they are not suggested everywhere

[ilya.gorbunov]

marcinmoskala: So where should we place an extension to convert a hex string to ByteArray?

[ilya.gorbunov]

That's what @mg6maciej means by proposing a top-level function byteArrayFromHexString.