Only allow single unary plus

Author: cknv

src/input/shared.rs

@@ -115,7 +115,7 @@ fn clean_int_str(mut s: &str) -> Option<Cow<str>> {
     s = s.trim();
 
     // strip leading unary plus
-    s = s.trim_start_matches('+');
+    s = s.strip_prefix('+').unwrap_or(s);
 
     // strip loading zeros
     s = strip_leading_zeros(s)?;

tests/validators/test_int.py

@@ -47,6 +47,7 @@
         ('+0_42', 42),
         ('+4_2.0', 42),
         ('+04_2.0', 42),
+        ('++4_2', Err('Input should be a valid integer, unable to parse string as an integer')),
         ('4_2', 42),
         ('0_42', 42),
         ('4_2.0', 42),