:art: improve int lexing funcs

diff --git a/ast b/ast
index fc8943f0e05aecd74cc36c4912cb399f5b68bf40..d35de89daa4142bcda9d679cf8b6e6228a86cd3b 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit fc8943f0e05aecd74cc36c4912cb399f5b68bf40
+Subproject commit d35de89daa4142bcda9d679cf8b6e6228a86cd3b