Purpose and Motivation

Fixes #4505, which came up as an issue after #4454 broke #4082.

The way the plot's domain values were previously calculated, accumulated resolution error meant that Array:series prevented the domain from reaching its upper boundary in some cases (before #4454, Array:series would overshoot its end value), which in turn meant the domain array would be one value less than the data coordinate array.

This fix replace Array:series with Array:interpolation to resample the domain, ensuring the domain hits the last value and its size matches exactly with the data coordinate array.

An example of the difference between the two methods:

(
var n = 228; // not all values of n "break"

y = n.collect{rrand(0,1.0)};

// generate corresponding domain values, 0 > 1
// via Array.series
x = (0.0, 0.0 + (y.size - 1).reciprocal .. 1.0);
"Array.series\n\ty size: %, x size: %, x last: %\n".postf(y.size, x.size, x.last);
// via Array.interpolation
x = Array.interpolation(y.size, 0.0, 1.0);
"Array.interpolation\n\ty size: %, x size: %, x last: %\n".postf(y.size, x.size, x.last);
\ok
)

Types of changes

• Bug fix

To-do list

• Code is tested
• All tests are passing
  - [ ] Updated documentation
• This PR is ready for review