PathMeasureMode.Distance Literal

Offset on the path measured in an approximate distance. Each offset step will cover roughly the same amount of length along the path.

For performance reasons this is a rough estimate of distance. Its precision may also change in future version (for the better)

Time: Offset on the path measured in time: a value from 0..1, where each segment is considered the same length. The actual length of the segments is not considered.
Distance: Offset on the path measured in an approximate distance. Each offset step will cover roughly the same amount of length along the path.