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Java Enum definition

I thought I understood Java generics pretty well, but then I came across the following in java.lang.Enum: 7 Answers ...
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How to handle click event in Button Column in Datagridview?

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Java default constructor

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Connection pooling options with JDBC: DBCP vs C3P0

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Accessing inactive union member and undefined behavior?

...t one set is UB, but I can't seem to find a solid reference (other than answers claiming it's UB but without any support from the standard). ...
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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?

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REST URI convention - Singular or plural name of resource while creating it

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Node.js / Express.js - How does app.router work?

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Should I use .done() and .fail() for new jQuery AJAX code instead of success and error

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