OpenMetrics draft specifies the default Go %g format.
Python is adding decimal number to the le field.
Like this:
request_duration_seconds_bucket{code="200",endpoint="/batch_read",le="1.0",method="GET",type="REST"} 545729.0
the le should be le="1"
This causes problems when comparing metrics with i.e. golang exported metrics
More about this prometheus/client_golang#500