v0.103.2

API breaking changes

• None.

Enhancements

• Improve the error messages when an I/O error occurs in writeCopyToURL.

Bugfixes

• Fix an assertion failure which could occur when opening a Realm after opening
  that Realm failed previously in some specific ways in the same run of the
  application.
• Reading optional integers, floats, and doubles from within a migration block
  now correctly returns nil rather than 0 when the stored value is nil.