use diamond <> pervasively
Replace Integer with Item class
improve toArray tests
improve javadoc wording for testSerialization methods
make some methods static as suggested by errorprone [MethodCanBeStatic]
convert to Diamond
improve populatedFoo methods
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improve main methods; respect system properties; actually fail if a test fails
improve testAddNonComparable
add more tests of exhausted iterators
coding style
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no wildcard imports
prefer assertNotSame, assertNotNull to assertTrue
add new test testAllAll_idempotent
slightly clearer javadoc
use third person in javadoc first sentence
assertEquals argument order
use serialClone in serialization tests; update imports
indexOf => contains
Update Creative Commons license URL in legal notices
add more assertions to testRemoveElement
very small improvements to testToArray2
strengthen toArray tests
trailing whitespace
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use autoboxing judiciously for readability
improve exception handling
untabify
better exception handling
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Simplify Navigable method names
Updated Navigable tests
Add SubMap/Set tests for TreeMap/Set
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