While testing ap_verify.measurements.TimingMetricTask for DM-16536, I found that I could not safely extract the "StartCpuTime" and "EndCpuTime" metadata values using PropertySet.getScalar, because the times were sometimes stored as floats and sometimes as strings:

Key = 'fringe.runStartCpuTime' -> 5.947655 ('Double')

Key = 'fringe.runEndCpuTime' -> '6.232034' ('String')

I've confirmed that even PropertySet.typeOf thinks that EndCpuTime should be a string in this example.

Find out what causes some keys to be stored as strings, and fix it.