Georgi Krastev

## Which issue does this PR close? Part of #2326 ## Rationale for this change Extending support for union types to primitive operations. ## What changes are included in this...

Empty string tail and init don't throw (unlike WrappedString)

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## Reproduction steps Scala version: 2.13.14 ```scala scala> "".tail val res0: String = "" scala> "".init val res1: String = "" scala> def tailOf[A](x: Seq[A]) = x.tail def tailOf[A](x: Seq[A]):...

Fix issues with detereministic generators

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This is a flawed proposal to fix #9101 I don't think it's possible to come up with an ideal solution without breaking binary compatibility or existing code. - Add a...

Reverts milessabin/shapeless#1407

Reduce jar size by using abstract classes

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Traits generate bridge methods in every subclass See #4750 ``` main, 2.12 - JVM: 6.1MB jar, 23.6MB uncompressed, 28.8MB on disk - JS: 10.9MB jar, 38.1MB uncompressed, 49.4MB on disk...

Use `-experimantal` compiler option

Reduce cloning in LogicalPlanBuilder

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## Which issue does this PR close? - Related to #4628 but goes in the other direction, using `Arc` in `LogicalPlanBuilder` ## Rationale for this change Since currently we do...

Fix client logic for backpressuring streams with prefetch

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The `prefetch` parameter was introduced in #636 but it has an issue: - the gRRC client has internal bookkeeping that remembers the requested amount of messages (in the deframer) -...