the restriction does not work if funty always stays optional

Cargo.toml

@@ -28,7 +28,7 @@ include = [
 ]
 
 [features]
-alloc = ["bitvec/alloc"]
+alloc = ["bitvec/alloc", "funty"]
 std = ["alloc", "bitvec/std", "memchr/use_std"]
 default = ["std", "bitvec", "lexical"]
 regexp = ["regex"]
@@ -40,6 +40,7 @@ version = "0.19.3"
 optional = true
 default-features = false
 
+# we need to restrict funty's version, until we can update bitvec to 0.21
 [dependencies.funty]
 version = ">1.0, <=1.1"
 optional = true