Re: Please tell me this is a bug?

[Adam D. Ruppe via Digitalmars-d]

On Sunday, 22 February 2015 at 02:27:30 UTC, Peter Alexander 
wrote:
Seems questionable to me. Anyone know the rationale?

I actually agree it is a bit questionable, but I think the 
difference is += is, conceptually at least, atomic - it is a 
single function, append() instead of two calls, set(calculate()).