diff --git a/implementations/python/tests/samples.bin b/implementations/python/tests/samples.bin
index 3d59549..e05af50 100644
Binary files a/implementations/python/tests/samples.bin and b/implementations/python/tests/samples.bin differ
diff --git a/implementations/python/tests/samples.pr b/implementations/python/tests/samples.pr
index a99aae9..76061db 100644
--- a/implementations/python/tests/samples.pr
+++ b/implementations/python/tests/samples.pr
@@ -79,7 +79,7 @@
   double-0: <Test #x"838000000000000000" -0.0>
   double1: <Test #x"833ff0000000000000" 1.0>
   double2: <Test #x"83fe3cb7b759bf0426" -1.202e300>
-  double3: <Test #x"83123456789abcdef0" #xd"123456789abcdef0">
+  double3: <Test #x"83123456789abcdef0" #xd"12 34 56 78  9a bc de f0">
   double4: @"Fewer than 16 digits" <ParseError "#xd\"12345678\"">
   double5: @"More than 16 digits" <ParseError "#xd\"123456789abcdef012\"">
   double6: @"Invalid chars" <ParseError "#xd\"12zz56789abcdef0\"">
@@ -89,11 +89,12 @@
   double10: @"-NaN" <Test #x"83fff0000000000111" #xd"fff0000000000111">
   double11: @"+NaN" <Test #x"837ff0000000000001" #xd"7ff0000000000001">
   double12: @"+NaN" <Test #x"837ff0000000000111" #xd"7ff0000000000111">
+  double13: @"Bad spacing" <ParseError "#xd\"12345 6789abcdef0\"">
   float0: <Test #x"8200000000" 0.0f>
   float+0: <Test #x"8200000000" +0.0f>
   float-0: <Test #x"8280000000" -0.0f>
   float1: <Test #x"823f800000" 1.0f>
-  float2: <Test #x"8212345678" #xf"12345678">
+  float2: <Test #x"8212345678" #xf"12 34  56 78">
   float3: @"Fewer than 8 digits" <ParseError "#xf\"123456\"">
   float4: @"More than 8 digits" <ParseError "#xf\"123456789a\"">
   float5: @"Invalid chars" <ParseError "#xf\"12zz5678\"">
@@ -103,6 +104,7 @@
   float9: @"+NaN" <Test #x"827f800111" #xf"7f800111">
   float10: @"-NaN" <Test #x"82ff800001" #xf"ff800001">
   float11: @"-NaN" <Test #x"82ff800111" #xf"ff800111">
+  float12: @"Bad spacing" <ParseError "#xf\"12345 678\"">
   int-257: <Test #x"a1feff" -257>
   int-256: <Test #x"a1ff00" -256>
   int-255: <Test #x"a1ff01" -255>
diff --git a/implementations/racket/preserves/preserves/tests/samples.pr b/implementations/racket/preserves/preserves/tests/samples.pr
index a99aae9..76061db 100644
--- a/implementations/racket/preserves/preserves/tests/samples.pr
+++ b/implementations/racket/preserves/preserves/tests/samples.pr
@@ -79,7 +79,7 @@
   double-0: <Test #x"838000000000000000" -0.0>
   double1: <Test #x"833ff0000000000000" 1.0>
   double2: <Test #x"83fe3cb7b759bf0426" -1.202e300>
-  double3: <Test #x"83123456789abcdef0" #xd"123456789abcdef0">
+  double3: <Test #x"83123456789abcdef0" #xd"12 34 56 78  9a bc de f0">
   double4: @"Fewer than 16 digits" <ParseError "#xd\"12345678\"">
   double5: @"More than 16 digits" <ParseError "#xd\"123456789abcdef012\"">
   double6: @"Invalid chars" <ParseError "#xd\"12zz56789abcdef0\"">
@@ -89,11 +89,12 @@
   double10: @"-NaN" <Test #x"83fff0000000000111" #xd"fff0000000000111">
   double11: @"+NaN" <Test #x"837ff0000000000001" #xd"7ff0000000000001">
   double12: @"+NaN" <Test #x"837ff0000000000111" #xd"7ff0000000000111">
+  double13: @"Bad spacing" <ParseError "#xd\"12345 6789abcdef0\"">
   float0: <Test #x"8200000000" 0.0f>
   float+0: <Test #x"8200000000" +0.0f>
   float-0: <Test #x"8280000000" -0.0f>
   float1: <Test #x"823f800000" 1.0f>
-  float2: <Test #x"8212345678" #xf"12345678">
+  float2: <Test #x"8212345678" #xf"12 34  56 78">
   float3: @"Fewer than 8 digits" <ParseError "#xf\"123456\"">
   float4: @"More than 8 digits" <ParseError "#xf\"123456789a\"">
   float5: @"Invalid chars" <ParseError "#xf\"12zz5678\"">
@@ -103,6 +104,7 @@
   float9: @"+NaN" <Test #x"827f800111" #xf"7f800111">
   float10: @"-NaN" <Test #x"82ff800001" #xf"ff800001">
   float11: @"-NaN" <Test #x"82ff800111" #xf"ff800111">
+  float12: @"Bad spacing" <ParseError "#xf\"12345 678\"">
   int-257: <Test #x"a1feff" -257>
   int-256: <Test #x"a1ff00" -256>
   int-255: <Test #x"a1ff01" -255>
diff --git a/tests/samples.bin b/tests/samples.bin
index 3d59549..e05af50 100644
Binary files a/tests/samples.bin and b/tests/samples.bin differ
diff --git a/tests/samples.pr b/tests/samples.pr
index a99aae9..76061db 100644
--- a/tests/samples.pr
+++ b/tests/samples.pr
@@ -79,7 +79,7 @@
   double-0: <Test #x"838000000000000000" -0.0>
   double1: <Test #x"833ff0000000000000" 1.0>
   double2: <Test #x"83fe3cb7b759bf0426" -1.202e300>
-  double3: <Test #x"83123456789abcdef0" #xd"123456789abcdef0">
+  double3: <Test #x"83123456789abcdef0" #xd"12 34 56 78  9a bc de f0">
   double4: @"Fewer than 16 digits" <ParseError "#xd\"12345678\"">
   double5: @"More than 16 digits" <ParseError "#xd\"123456789abcdef012\"">
   double6: @"Invalid chars" <ParseError "#xd\"12zz56789abcdef0\"">
@@ -89,11 +89,12 @@
   double10: @"-NaN" <Test #x"83fff0000000000111" #xd"fff0000000000111">
   double11: @"+NaN" <Test #x"837ff0000000000001" #xd"7ff0000000000001">
   double12: @"+NaN" <Test #x"837ff0000000000111" #xd"7ff0000000000111">
+  double13: @"Bad spacing" <ParseError "#xd\"12345 6789abcdef0\"">
   float0: <Test #x"8200000000" 0.0f>
   float+0: <Test #x"8200000000" +0.0f>
   float-0: <Test #x"8280000000" -0.0f>
   float1: <Test #x"823f800000" 1.0f>
-  float2: <Test #x"8212345678" #xf"12345678">
+  float2: <Test #x"8212345678" #xf"12 34  56 78">
   float3: @"Fewer than 8 digits" <ParseError "#xf\"123456\"">
   float4: @"More than 8 digits" <ParseError "#xf\"123456789a\"">
   float5: @"Invalid chars" <ParseError "#xf\"12zz5678\"">
@@ -103,6 +104,7 @@
   float9: @"+NaN" <Test #x"827f800111" #xf"7f800111">
   float10: @"-NaN" <Test #x"82ff800001" #xf"ff800001">
   float11: @"-NaN" <Test #x"82ff800111" #xf"ff800111">
+  float12: @"Bad spacing" <ParseError "#xf\"12345 678\"">
   int-257: <Test #x"a1feff" -257>
   int-256: <Test #x"a1ff00" -256>
   int-255: <Test #x"a1ff01" -255>