Possible recursion beyond call stack size

[benjamintd]

When using polyclip-ts on large polygons, the maximum call stack size is sometimes reached:

RangeError: Maximum call stack size exceeded
    at _Segment.afterState (/project/node_modules/polyclip-ts/src/segment.ts:466:3)
    at _Segment.beforeState (/project/node_modules/polyclip-ts/src/segment.ts:461:31)
    at _Segment.afterState (/project/node_modules/polyclip-ts/src/segment.ts:469:30)
    at _Segment.beforeState (/project/node_modules/polyclip-ts/src/segment.ts:461:31)
    at _Segment.afterState (/project/node_modules/polyclip-ts/src/segment.ts:469:30)
    at _Segment.beforeState (/project/node_modules/polyclip-ts/src/segment.ts:461:31)
    at _Segment.afterState (/project/node_modules/polyclip-ts/src/segment.ts:469:30)
    at _Segment.beforeState (/project/node_modules/polyclip-ts/src/segment.ts:461:31)
    at _Segment.afterState (/project/node_modules/polyclip-ts/src/segment.ts:469:30)
    at _Segment.beforeState (/project/node_modules/polyclip-ts/src/segment.ts:461:31)

Example : running union on the features of this collection:
union.json

[mourner]

Just got a similar issue but in another subroutine, will try to get a test case...