weak 1.1.0+1

Weak referenced collections - WeakHashMap, WeakHashSet, WeakList, and WeakReferenceQueue implemented with WeakReference and Finalizer.

1.1.0+1

• dart format source codes

1.1.0

• add [WeakList.nonNulls] for the case that no need to iterate nulls (for better performance)
• and [WeakList.nonNullsReversed] for the case that no need to iterate nulls reversely (for better performance)
• add [WeakList.getNonNullRange] for the case that no need to iterate nulls in a range
• add [WeakList.getNonNullRangeReversed] for the case that no need to iterate nulls reversely in a range
• tune [WeakList.where] about non-null iteration for better performance

1.0.0+2

• run dart fix on lints 5.1.1 (package:lints/recommended.yaml)
• minor: tune dartdoc

1.0.0+1

• add an example
• dart format source codes
• add some comments

1.0.0

• Initial version.