* Bug fixes

  * Fixes issue with Flexvolume, introduced in 1.6.0, where drivers without an attacher would fail (node indefinitely waiting for attach). A driver API addition is introduced: drivers that don't implement attach should return attach: false on init. ([#47503](https://github.com/kubernetes/kubernetes/pull/47503), [@chakri-nelluri](https://github.com/chakri-nelluri))

	</li>
</ul>

<p>
A comparison of two interface values with identical dynamic types
causes a <a href="#Run_time_panics">run-time panic</a> if that type
is not comparable.  This behavior applies not only to direct interface
value comparisons but also when comparing arrays of interface values
or structs with interface-valued fields.
</p>

<p>
Slice, map, and function types are not comparable.

### Internal

pkg crypto/x509, var IncorrectPasswordError error
pkg database/sql, method (*DB) Ping() error
pkg database/sql, method (*DB) SetMaxIdleConns(int)
pkg database/sql/driver, type Queryer interface { Query }
pkg database/sql/driver, type Queryer interface, Query(string, []Value) (Rows, error)
pkg debug/dwarf, const AttrAbstractOrigin = 49
pkg debug/dwarf, const AttrAccessibility = 50
pkg debug/dwarf, const AttrAddrClass = 51