.TP
.B URLF_STRICT
Be strict about escaping non-alphanumeric characters. Without this,
-potentially unsafe characters such as
+potentially unsafe characters such as
.RB ` / '
and
.RB ` ~ '
Be very lax about non-alphanumeric characters. Everything except
obviously-unsafe characters like
.RB ` & '
-and
+and
.RB ` = '
are left unescaped.
.PP