This is a maintenance pre-release that should fix most obvious problems with Qt >= 5.12 due to overflow checking issues.
See https://www.riverbankcomputing.com/static/Docs/PyQt5/incompatibilities.html\#pyqt-v5-12.
Setting PyQt5.sip.enableoverflowchecking(False) had no effect, apparently, so many calls to the Qt drawing directives have been reviewed and changed accordingly. Other may be still present. Please report any other potential incompatibilities founds.