find_knot claims to handle floating point errors, but seems to cause them

[amaramth]

if i run the getting started hello world, but replace spline.equidistant_knot_seq(15) with spline.equidistant_knot_seq(7000), it makes lots of NaN, but if i remove tinyspline.c#L1216-L1222 the results appear correct

 * It is recommended that ::TS_KNOT_EPSILON is aligned to the span of
 * ::TS_DOMAIN_DEFAULT_MIN and ::TS_DOMAIN_DEFAULT_MAX. That is, adjacent
 * floating point values in the domain [::TS_DOMAIN_DEFAULT_MIN,
 * ::TS_DOMAIN_DEFAULT_MAX] should not be equal according to
 * ::TS_KNOT_EPSILON.

this issue may be related to the default TS_KNOT_EPSILON not having this property

i'd like to know what the purpose of lines 1216-1222 is, in case removing them bites later