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

String representations of dataset objects are used for previewing their contents from the terminal. When converting a Dataset object to a string, we build a table using ascii characters. The current table has fixed width columns that do not take full advantage of the terminal real estate if the dataset only contains a few columns.

echo $dataset;

<img width="574" alt="Annotation

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.