Sequel 4.21.0 Released

Sequel 4.21.0 was released today! Full release notes are available, but here are some highlights:

• SQL::GenericExpression#=~ has been added for easier equality/inclusion/identity expressions in virtual rows.
• SQL::GenericExpression#!~ has been added on ruby 1.9 for easier inverted equality/inclusion/identity expressions in virtual rows.
• Database#add_named_conversion_proc has been added on PostgreSQL for adding conversion procs for named types.
• Database#transaction now works correctly inside after_commit/after_rollback hooks.