Directly support changing how Bytes are stored.

[m4xy]

Overriding the PolarLoader to save the bytes elsewhere is surely common. But doing so is clumsy since there are now unused fields like savePath. A step of abstraction would be easy to implement and make more sense:

Two simple solutions would be:
1: Making the PolarLoader abstract and creating a FilePolarLoader and any other common ones you think would be valuable such as SqlPolarLoader.

2: Or to avoid users needing to make changes, making an interface such as ByteLoader that has two methods:

interface ByteLoader {
  fun saveBytes(array: ByteArray)
  fun loadBytes(): ByteArray
}

is sufficient. Then just make a constructor overload for taking in a ByteLoader and implement the default ones to use:

class FileByteLoader(val saveFile: Path) {
 // etc
}