make local variables local

.. to not interfere with variables in the scripts that source these utils.

utils.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 isarray() {
-    var=$1
+    local var=$1
     declare -p $1 2> /dev/null | grep -q '^declare \-a' && return 0
     [[ ${var[0]} -eq ${var[0]} ]] && [[ ${var[1]} -eq ${var[1]} ]] && return 0 || return 1
 }