Multi-type props defined without value gets empty string, should be true [Boolean, String] #7485
Description
Version
2.5.13
Reproduction link
https://jsfiddle.net/realcarbonneau/68w22cbo/
Steps to reproduce
Define a multi-type Boolean and String Prop, call the component by specifying the prop name (without a value).
What is expected?
Prop contains true (Boolean type)
What is actually happening?
Prop contains an empty string
The sequence does not change the result, both [Boolean, String] and [String, Boolean] give the same result. The version does not change the result either (vue version 1.0.12, 2.2.1, edge on jsfiddle)