If &str is not growable but String is, the bytes in a String will need to be on the heap so when I do String::from does it clone the bytes right away or does it wait till I try to grow the container and then copy the bytes to the new one on the heap.
#Does String::from("some string here"); clone the bytes of the supplied literal to a heap alloc?
rancid plover
peak dragon
https://doc.rust-lang.org/std/string/struct.String.html#impl-From<%26str>-for-String
That blurb says that "the result is allocated on the heap". So, it's an eager byte copy.
slim crystal
Yeah, whatever character data the &str is referencing could be dropped before the String grows, and then it can't copy over the bytes, so it does it right away.