lib/string: `Int::to_s` shortcuts 0 and 1

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index e78f655..63c8226 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -1953,6 +1953,10 @@ redef class Int
        #     assert 1.to_s            == "1"
        #     assert (-123).to_s       == "-123"
        redef fun to_s do
+               # Fast case for common numbers
+               if self == 0 then return "0"
+               if self == 1 then return "1"
+
                var nslen = int_to_s_len
                var ns = new NativeString(nslen + 1)
                ns[nslen] = '\0'