try

d2layouts/d2cycle/layout.go

@@ -117,7 +117,7 @@ func createCircularArc(edge *d2graph.Edge) {
 			tangentX /= mag
 			tangentY /= mag
 		}
-        const MIN_SEGMENT_LEN = 3.9
+        const MIN_SEGMENT_LEN = 3.9999999999
 
 		dx := lastPoint.X - secondLastPoint.X
 		dy := lastPoint.Y - secondLastPoint.Y

e2etests/testdata/txtar/cycle-diagram/dagre/board.exp.json

@@ -864,8 +864,8 @@
           "y": -37.47600173950195
         },
         {
-          "x": 196.60899353027344,
-          "y": -36.84600067138672
+          "x": 196.5919952392578,
+          "y": -36.94499969482422
         },
         {
           "x": 197.2519989013672,
@@ -1228,8 +1228,8 @@
           "y": 197.53700256347656
         },
         {
-          "x": 30.364999771118164,
-          "y": 197.71299743652344
+          "x": 30.464000701904297,
+          "y": 197.6999969482422
         },
         {
           "x": 26.5,
@@ -1592,8 +1592,8 @@
           "y": 37.47600173950195
         },
         {
-          "x": -196.60899353027344,
-          "y": 36.84600067138672
+          "x": -196.5919952392578,
+          "y": 36.94499969482422
         },
         {
           "x": -197.2519989013672,
@@ -1972,8 +1972,8 @@
           "y": 111.8030014038086
         },
         {
-          "x": 702.739990234375,
-          "y": 113.32499694824219
+          "x": 702.7730102539062,
+          "y": 113.23100280761719
         },
         {
           "x": 701.4329833984375,
@@ -2336,8 +2336,8 @@
           "y": 186.90899658203125
         },
         {
-          "x": 366.2359924316406,
-          "y": 185.91200256347656
+          "x": 366.302001953125,
+          "y": 185.98699951171875
         },
         {
           "x": 363.6419982910156,

e2etests/testdata/txtar/cycle-diagram/elk/board.exp.json

@@ -864,8 +864,8 @@
           "y": -25.47599983215332
         },
         {
-          "x": 208.60899353027344,
-          "y": -24.84600067138672
+          "x": 208.5919952392578,
+          "y": -24.94499969482422
         },
         {
           "x": 209.2519989013672,
@@ -1228,8 +1228,8 @@
           "y": 209.53700256347656
         },
         {
-          "x": 42.3650016784668,
-          "y": 209.71299743652344
+          "x": 42.4640007019043,
+          "y": 209.6999969482422
         },
         {
           "x": 38.5,
@@ -1592,8 +1592,8 @@
           "y": 49.47600173950195
         },
         {
-          "x": -184.60899353027344,
-          "y": 48.84600067138672
+          "x": -184.5919952392578,
+          "y": 48.94499969482422
         },
         {
           "x": -185.2519989013672,
@@ -1972,8 +1972,8 @@
           "y": 123.8030014038086
         },
         {
-          "x": 675.239990234375,
-          "y": 125.32499694824219
+          "x": 675.2730102539062,
+          "y": 125.23100280761719
         },
         {
           "x": 673.9329833984375,
@@ -2336,8 +2336,8 @@
           "y": 198.90899658203125
         },
         {
-          "x": 338.7359924316406,
-          "y": 197.91200256347656
+          "x": 338.802001953125,
+          "y": 197.98699951171875
         },
         {
           "x": 336.1419982910156,