What makes strings harder than for example []byte?

On Wed, Feb 1, 2017, 06:15 Ian Lance Taylor <i...@golang.org> wrote:

> On Tue, Jan 31, 2017 at 9:10 PM, Eliot Hedeman
> <eliot.d.hede...@gmail.com> wrote:
> > I was writing up a proposal about adding the small string
> > optimization(putting strings on the heap if they will fit within the
> > sringStruct)to the go runtime, and I realized there might be good reason
> why
> > this has not been done yet. Are there any glaring reasons you can think
> of?
> > Here is the really rough draft of the proposal. Thanks for the feedback!
>
> The problem is that the concurrent garbage collector needs to be able
> to determine reliably and safely whether a word in memory, including
> on the stack, contains a pointer or not.  It's not OK to have a word
> in memory that might or might contain a pointer.  It's a good thing
> that Go doesn't have unions in the language, because they would be
> very difficult to implement in the garbage collector.
>
> Ian
>
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