Also encode large floats as exponent syntax in toml-test integration

Author: arp242

decode.go

@@ -430,7 +430,7 @@ func (md *MetaData) unifyString(data any, rv reflect.Value) error {
 		if i, ok := data.(int64); ok {
 			rv.SetString(strconv.FormatInt(i, 10))
 		} else if f, ok := data.(float64); ok {
-			rv.SetString(strconv.FormatFloat(f, 'f', -1, 64))
+			rv.SetString(strconv.FormatFloat(f, 'g', -1, 64))
 		} else {
 			return md.badtype("string", data)
 		}

internal/tag/add.go

@@ -69,7 +69,7 @@ func Add(key string, tomlData any) any {
 		case math.IsInf(orig, -1):
 			return tag("float", "-inf")
 		default:
-			return tag("float", strconv.FormatFloat(orig, 'f', -1, 64))
+			return tag("float", strconv.FormatFloat(orig, 'g', -1, 64))
 		}
 	}
 }