Comment on private ListBuffer.locate [ci: last-only]

…sage

Use List.fill instead of range [ci: last-only]

…array

IterableOnce#copyToArray uses helper for count [ci: last-only]

This fixes scala/scala#13108 when comparing Seq[Float] with Seq[Float] it expected
that Float.NaN != Float.NaN and 0.0 equals -0.0f. But before this patch
this was violated by ArraySeq.ofFloat/ofDouble

Fix ArraySeq.ofFloat/ofDouble.equals for floating point

Extract branches to be mostly dependent on `isInclusive` and
`step >= 0`. These are often constant, and when they're not
statically constant, they are probably predictable anyway.

This commit upstreams
scala-js/scala-js@a5337ed
from Scala.js.

Previously, `Range` used a number of intermediate operations on
`Long`s to avoid overflow. We can streamline a lot of code by
using unsigned `Int` arithmetics. In particular, there is only 1
division in the initialization path, instead of 3.

Although the fields have not changed, the content of
`numRangeElements` is more strict for overfull ranges. This means
that deserializing an overfull range from a previous version would
not be safe. This is why we bump the SerialVersionUID.

This commit upstreams
scala-js/scala-js@d972218
from Scala.js.

Avoid evaluating `value0` twice on completed Futures for performance.

perf: avoid double checking `value0` Future.