Heist: We realized that the $() syntax Heist uses for accessing splices inside of HTML attributes conflicts with the jQuery ‘$’ function. We changed the syntax to ${} to fix this. This is a major breaking change, so we added a temporary compatibility mode to Heist that you can enable by using the useOldAttributeSyntax function to modify your TemplateState. We will remove this compatibility mode in the next major release, so update your templates ASAP!