* Add jdk 13 to build matrix
* Adjust indentation
* Adjust indentation
* Bump kemitix-maven-tiles from 1.2.0 to 2.4.1
* Fix TypeAlias.equals(Object) does not check for null argument
net.kemitix.mon.TypeAlias.equals(Object) does not check for null argument [net.kemitix.mon.TypeAlias] At TypeAlias.java:[lines 82-88] NP_EQUALS_SHOULD_HANDLE_NULL_ARGUMENT
* Fix TypeAlias.flatMap(Function) declares unbound method template parameter
[ERROR] Method net.kemitix.mon.TypeAlias.flatMap(Function) declares unbound method template parameter(s) [net.kemitix.mon.TypeAlias] At TypeAlias.java:[line 72] UMTP_UNBOUND_METHOD_TEMPLATE_PARAMETER
* Fix Lazy has a circular dependency with other classes
[ERROR] Class net.kemitix.mon.lazy.Lazy has a circular dependency with other classes [net.kemitix.mon.lazy.Lazy] At Lazy.java:[lines 36-46] FCCD_FIND_CLASS_CIRCULAR_DEPENDENCY
* Fix Synchronization performed on AtomicReference
[ERROR] Synchronization performed on java.util.concurrent.atomic.AtomicReference in net.kemitix.mon.lazy.LazySupplier.value() [net.kemitix.mon.lazy.LazySupplier] At LazySupplier.java:[line 61] JLM_JSR166_UTILCONCURRENT_MONITORENTER
* Fix Just.orElseThrow(Supplier) declares throwing an exception that isn't thrown
[ERROR] Non derivable method net.kemitix.mon.maybe.Just.orElseThrow(Supplier) declares throwing an exception that isn't thrown [net.kemitix.mon.maybe.Just] At Just.java:[line 102] BED_BOGUS_EXCEPTION_DECLARATION
* Fix Maybe has a circular dependency with other classes
[ERROR] Class net.kemitix.mon.maybe.Maybe has a circular dependency with other classes [net.kemitix.mon.maybe.Maybe] At Maybe.java:[lines 40-94] FCCD_FIND_CLASS_CIRCULAR_DEPENDENCY
* Fix Maybe.findFirst(Stream) uses immediate execution of a block
[ERROR] Method net.kemitix.mon.maybe.Maybe.findFirst(Stream) uses immediate execution of a block of code that is often not used [net.kemitix.mon.maybe.Maybe] At Maybe.java:[line 94] OI_OPTIONAL_ISSUES_USES_IMMEDIATE_EXECUTION
* Fix Success/Result/Err has a circular dependency
[ERROR] Class net.kemitix.mon.result.Err has a circular dependency with other classes [net.kemitix.mon.result.Err] At Err.java: FCCD_FIND_CLASS_CIRCULAR_DEPENDENCY
* Fix GeneralisedTree has a circular dependency
[ERROR] Class net.kemitix.mon.tree.GeneralisedTree has a circular dependency with other classes [net.kemitix.mon.tree.GeneralisedTree] At GeneralisedTree.java:[lines 39-80] FCCD_FIND_CLASS_CIRCULAR_DEPENDENCY
* Supress warning about boxing a boolean
NAB_NEEDLESS_BOOLEAN_CONSTANT_CONVERSION
Without creating a whole reimplemention of Maybe/Just/Nothing purely for `boolean` primitives, we can’t avoid this boxing.
* Supress store before return warnings in Lombok generate hashCode
USBR_UNNECESSARY_STORE_BEFORE_RETURN
The annotation has to be used at the class level, which unfortunately means we have no store-before-return checks for the rest of the class.
* Suppress warning about unused parameter
The type parameter for `Tree.builder(type)` is used to specify the parameterised type of the return value.
* Checkstyle fixups
* [changelog] updated
* [readme] use valid haskell example
* [tree] Immediately return this expression instead of assigning it to the temporary variable "treeList".
* [tree] Use normal defensive copying for array fields
QA tools want these fields to be static, for which lombok creates static getter
methods, which then don't match the specification from the `Either` interface.
