If you mean round-half-to-even, it is orthogonal to effective vs notational rounding.  1.15 in binary floating point number is not on a midpoint of 1.1 and 1.2, so no need of tie-breaking.

If you mean always round to even, the result would be consistent across implementations,  We could list that (though it's different behavior than Scheme's "round"; the difference is apparent when precision is 0).