Coil fixed segment length order

src/canvas.typ

@@ -32,6 +32,8 @@
   }
   assert(length / 1cm != 0,
     message: "Canvas length must be != 0!")
+  assert(not float.is-infinite(length / 1cm),
+    message: "Length must not be infinite!")
 
   let ctx = (
     version: version.version,

src/path-util.typ

@@ -260,7 +260,7 @@
     }
   }
 
-  let segment = segment-at-t(segments, t, samples: samples, rev: rev)
+  let segment = segment-at-t(segments, t, samples: samples, rev: rev, clamp: true)
   return if segment != none {
     let (distance, segment, length, ..) = segment
     _point-on-segment(segment, if rev { length - distance } else { distance }, samples: samples, extrapolate: extrapolate)

tests/decorations/path/test.typ

@@ -90,3 +90,11 @@
 
   wave(line((0,0), (4,0)), segments: 1)
 })
+
+// Bug #757: Coil only works with specific order
+#block(width: 10cm, canvas(length:10cm,{
+  import draw: *
+  let a = (1, 0)
+  let b = (0.12, 0.3)
+  coil(hobby(b,a),amplitude:0.051,segment-length:0.05112,align:"MID")
+}))