pathLength doens't work on non-scaling-stroke [BUG]

[ShanonJackson]

2. Describe the bug
path length should animate even on non-scaling-strokes; My suspicion is you are calculating the line length using the DOM method .getTotalLength() however this returns the incorrect value for strokes with non-scaling-stroke this css value is extremely important to people creating graphs that are horizontally responsive without skew'ing the svg paths.

3. IMPORTANT: Provide a CodeSandbox reproduction of the bug
https://codesandbox.io/s/kind-knuth-b1ed2?file=/src/index.tsx
Let me know if this doesn't work don't use code sandbox often.

5. Expected behavior
Line shouldn't have gaps.

Refactoring out of react-spring love the library so this is a blocker for me atm but other than that had no problems with library.

EDIT: Possible solution outlined here:
https://stackoverflow.com/questions/44389668/svg-gettotallength-wont-return-the-right-size-for-non-scaling-stroke-get-sv