resolve fixed str tests

Author: tgross35

library/coretests/tests/num/flt2dec/mod.rs

@@ -1231,42 +1231,12 @@ where
         assert_eq!(to_string(f, minf16, Minus, 1), "0.0");
         assert_eq!(to_string(f, minf16, Minus, 2), "0.00");
         assert_eq!(to_string(f, minf16, Minus, 4), "0.0000");
-        assert_eq!(to_string(f, minf16, Minus, 8), "0.00000000");
-        assert_eq!(to_string(f, minf16, Minus, 16), "0.0000000000000000");
-        assert_eq!(to_string(f, minf16, Minus, 32), "0.00000000000000000000000000000000");
-        assert_eq!(
-            to_string(f, minf16, Minus, 64),
-            "0.0000000000000000000000000000000000000000000014012984643248170709"
-        );
-        assert_eq!(
-            to_string(f, minf16, Minus, 128),
-            "0.0000000000000000000000000000000000000000000014012984643248170709\
-                  2372958328991613128026194187651577175706828388979108268586060149"
-        );
-        assert_eq!(
-            to_string(f, minf16, Minus, 256),
-            "0.0000000000000000000000000000000000000000000014012984643248170709\
-                  2372958328991613128026194187651577175706828388979108268586060148\
-                  6638188362121582031250000000000000000000000000000000000000000000\
-                  0000000000000000000000000000000000000000000000000000000000000000"
-        );
-
-        assert_eq!(
-            to_string(f, f16::MAX, Minus, 0),
-            "1797693134862315708145274237317043567980705675258449965989174768\
-                0315726078002853876058955863276687817154045895351438246423432132\
-                6889464182768467546703537516986049910576551282076245490090389328\
-                9440758685084551339423045832369032229481658085593321233482747978\
-                26204144723168738177180919299881250404026184124858368"
-        );
-        assert_eq!(
-            to_string(f, f16::MAX, Minus, 10),
-            "1797693134862315708145274237317043567980705675258449965989174768\
-                0315726078002853876058955863276687817154045895351438246423432132\
-                6889464182768467546703537516986049910576551282076245490090389328\
-                9440758685084551339423045832369032229481658085593321233482747978\
-                26204144723168738177180919299881250404026184124858368.0000000000"
-        );
+        assert_eq!(to_string(f, minf16, Minus, 8), "0.00000006");
+        assert_eq!(to_string(f, minf16, Minus, 10), "0.0000000596");
+        assert_eq!(to_string(f, minf16, Minus, 15), "0.000000059604645");
+        assert_eq!(to_string(f, minf16, Minus, 20), "0.00000005960464477539");
+        assert_eq!(to_string(f, minf16, Minus, 24), "0.000000059604644775390625");
+        assert_eq!(to_string(f, minf16, Minus, 32), "0.00000005960464477539062500000000");
     }
 
     let minf32 = ldexp_f32(1.0, -149);