We have added default serializers to the 4.2 series here:
hazelcast/hazelcast#17934

There is a problem with backward compatibility. If a user had CustomSerializer for optional in 4.1, in 4.2 there is no way to use their serializers, and Hazelcast will throw java.lang.IllegalArgumentException: [class java.util.Optional] serializer cannot be overridden

Users can basi

When grouping by variable in Pivot Table, it would be nice if Group By would output an actual date for datetime variables.

E.g.:

• A mean of [2020-01-01, 2020-01-02, 2020-01-03] would output 2020-01-02.
• A median of [2020-01-01, 2020-01-02, 2020-01-03, 2020-01-03, 2020-01-04] would output 2020-01-03.
• A sum ... Don't know. Probably output a float?
• Min, max ... This one is obvious.
• Va

The built-in Screen logger is fantastic for outputting log messages to the console but what if the user wants to output them to a file instead? Yes, they can use MonoLog but that requires typing stuff into composer and waiting. I think we can provide alot of value by way of user experience by incl

The PR JuliaData/CategoricalArrays.jl#310 means that an array with elements of type Symbol can no longer be wrapped as a CategoricalArray.

This means all MLJ documentation and test code that uses symbols in categorical data must be refactored to use strings instead.

These repos, at least, need checking/refactoring, in order of priority:

• MLJ

• [x]

Introduction
As a tester or developer, I want to have correct answer for Hepta FCPS sample so that I can use it in test scenarios to improve quality of the library.

Acceptance Criteria

• Introduce Hepta.answer that will contain cluster labels for points from Hepta.data.
• Add Hepta.answer to definitions.