test(number): cover zero-prefixable exponent digits

Assisted-by: GLM 5.3

interpres_test.go

@@ -421,6 +421,10 @@ func TestAcceptsNumberEdgeCases(t *testing.T) {
 		"3.14":        3.14,
 		"6.022e23":    6.022e23,
 		"1e10":        1e10,
+		"1e0":         1.0,
+		"1e06":        1e6,
+		"0e00":        0.0,
+		"2E-3":        2e-3,
 		"-2.5E-3":     -2.5e-3,
 	}
 	for tok, want := range cases {

number.go

@@ -104,7 +104,9 @@ func decodeFloat(tok string) (any, error) {
 		build += "." + fp
 	}
 	// The ABNF requires at least one digit after the exponent marker, so a
-	// trailing e or E is an error even though strconv would accept it.
+	// trailing e or E is an error even though strconv would accept it. The
+	// digits are a zero-prefixable integer, so leading zeros are fine here
+	// (the corpus holds valid cases such as 1e06 and 0e00).
 	if hasExp {
 		esign, edigits := splitSign(exp)
 		ed, err := joinDigits(edigits, isDecDigit)