along returns a point that is not found by pointOnLine

[grundid]

When I generate a point using the along function the pointOnLine function does not see this point as on line. It also returns a NaN value for location.
Example:

const line1 = turf.lineString([[7, 50], [8, 50], [9, 50]]);
const pointAlong = turf.along(line1, 10);
const pointOnLine = turf.pointOnLine(line1, pointAlong);

The resulting pointOnLine value looks like this:

{ type: 'Feature',
  properties: { dist: 0.057664328657654904, location: NaN, index: 0 },
  geometry: { type: 'Point', coordinates: [ 7.139803396792796, 50 ] } }

It is not documented that location can become NaN.

I would assume that the pointOnLine should match the pointAlong. This is the case if I pass for example the point [8, 50]. The result is:

{ type: 'Feature',
  properties: { dist: 0, index: 1, location: 71.49662609671813 },
  geometry: { type: 'Point', coordinates: [ 8, 50 ] } }

[DenisCarriere]

Nice to do: Can you use ```javascript to style your Markdown codeblocks (my eyes are bad at differentiating comments vs. code blocks).

I also noticed location = NaN while updating the test cases today.

location: distance along the line between start and the closest point.

I would assume if the start point & closest point are the same, then the "distance along the line" would be 0 instead of NaN.

[dpmcmlxxvi]

@grundid Can you double check that this is resolved with PR #750 so the issue can be closed?

[grundid]

I'm sorry, but I don't have a test setup for this repo. I'll try after the release and reopen if this is still an issue.

[DenisCarriere]

Added tests for this issue, location does not return NaN anymore.