commit 8d0d5058dc898a24c7a36fc5dff11f25e0b0221e
Author: John Denker <jsd@av8n.com>
Date:   Thu Jul 8 19:45:01 2021 -0700

    repair go_fake_floor() so that fuzzy rounding works
    for negative (not just positive) inputs

diff --git a/goffice/math/go-math.c b/goffice/math/go-math.c
index 6b0c8a23..ddd9434e 100644
--- a/goffice/math/go-math.c
+++ b/goffice/math/go-math.c
@@ -240,6 +240,16 @@ go_d2d (double x)
 	return *px;
 }
 
+/***
+ ++ This function behaves like gnumeric.int()
+ and "almost" like POSIX.floor(),
+ i.e. it always rounds toward minus infinity.
+
+ Like all gnumeric rounding functions and unlike POSIX,
+ it performs fuzzy rounding.
+
+ -- Despite the name, it does not behave like gnumeric.floor().
+ ***/
 double
 go_fake_floor (double x)
 {
@@ -248,9 +258,8 @@ go_fake_floor (double x)
 	if (x == floor (x))
 		return x;
 
-	return (x >= 0)
-		? floor (go_add_epsilon (x))
-		: floor (go_sub_epsilon (x));
+/* if x is very near an integer, use the integer instead: */
+	return floor (go_add_epsilon (x));
 }
 
 double