If an attribute corresponds to a property, which default value is a boolean, the attribute value is also processed as boolean, eg.:
<palindrom-client use-web-socket="true">
<palindrom-client use-web-socket="false">
Will be interpreted as:
{ useWebSocket: true }
{ useWebSocket: false }
Implemented in PR #84
Warning: This is likely to change again in the future, see #85