Beta 0.4.0

Breaking

• Null() and Empty() query builder options were merged into NullOrDefault()
• Strings are no longer invariant by default and require the Invariant() builder option to behave like before the update

Additions

• MongoDB storage backend via general web proxy driver implementation
• Refactored query builder API to offer options for Invariant() and Partial() string matches
• Added support for UTF8 string length

Fixes

• Fixed array equality implementation that lead to false positive results