After the parameterized trigger plugin wants to exchange all choices to extensible choices we have to change many properties in our jobs. But that's OK.

Problem:
Because of many of our properties containing dots we have to overwork half of our build process.

Suggestion:
Please check if the name of a property can contain . too.

Extensible Choice Parameter checks parameter names as Jenkins 1.466 expands variable
(that is, alphabets, numbers, and underscore: https://github.com/jenkinsci/jenkins/blob/jenkins-1.466/core/src/main/java/hudson/Util.java#L111 )

Jenkins 1.526 gets to allow dots in JENKINS-16660, f664639.

Extensible Choice Parameter should check parameter names as the Jenkins core it runs on.