docs: non-features

closes #210
closes #212

README.md

@@ -10,6 +10,7 @@ michie (pronounced /'mikɪ/) — an attribute macro that adds [memoization] to a
 # Table of contents
 
 1. [Features](#features)
+1. [Non-features](#non-features)
 1. [key_expr](#key_expr)
 1. [key_type](#key_type)
 1. [store_type](#store_type)
@@ -40,6 +41,13 @@ michie (pronounced /'mikɪ/) — an attribute macro that adds [memoization] to a
 - Supports recursive functions
 - Bring your own store
 
+# Non-features
+
+- Caching features: this crate does not provide a caching mechanism other than some trivial implementations.
+  It allows you to bring your own.
+- "Blazingly fast": this crate aims to provide a simple and easy-to-use means of memoizing a function.
+  If you *actually really* require micro-optimized memoization then you'd most likely have to implement it yourself.
+
 # key_expr
 
 In each invocation a key is obtained.

tests/readme.rs

@@ -38,7 +38,7 @@ fn limited_character_set_in_headings() {
             };
             assert!(
                 text.chars()
-                    .all(|c| c.is_alphanumeric() || c == ' ' || c == '_'),
+                    .all(|c| c.is_alphanumeric() || c == ' ' || c == '_' || c == '-'),
                 "{}",
                 text
             );