diff --git a/dev/src/repl.clj b/dev/src/repl.clj
index 6f289d2..fcb45b5 100644
--- a/dev/src/repl.clj
+++ b/dev/src/repl.clj
@@ -6,6 +6,10 @@
     [tick.core :as t])
   (:import (java.util TimeZone)))
 
+(comment 
+  (remove-ns 'repl)
+  )
+
 (clojure.tools.namespace.repl/set-refresh-dirs "src" "test")
 
 (set! *warn-on-reflection* true)
diff --git a/docs/cheatsheet.md b/docs/cheatsheet.md
index 7a8c788..a10fc29 100644
--- a/docs/cheatsheet.md
+++ b/docs/cheatsheet.md
@@ -1,8 +1,9 @@
 # Need to know 
 
-* Understand [the entities of java.time](https://github.com/juxt/tick#javatime)
 * a `temporal` is an entity that relates to the timeline (LocalDate, Instant, ZonedDateTime etc)
-* a `temporal-amount` is a quantity of time - either a Duration or a Period
+* a `temporal-amount` is an entity representing a quantity of time - either a Duration or a Period
+* a basic understanding of [the main entities of java.time](https://github.com/juxt/tick#javatime) is required to use tick
+* Where tick doesn’t provide the API you need, drop to [cljc.java-time](https://github.com/henryw374/cljc.java-time)
 
 # Naming (compared to java.time)
 
@@ -22,28 +23,29 @@ All functions relating to `temporals` have names in the singular, whereas functi
 
 ## Construction
 
-### Now 
+### Now
+
+zero-arity function for the required type 
 
 ```clojure
 (t/date), (t/zoned-date-time), (t/instant), (t/...)
 ```
 
-temporarily change what clock is used to get the `now` or `where` information with `with-clock`
+Temporarily change what clock is used to get the `now` or `where` information with `with-clock`
 
 ```clojure
-(t/with-clock 
-  ; the given 'clock' could be also be a zone, or a zoned-date-time etc
-  (t/instant "2023-08-23T15:49:21.941342Z") 
+(t/with-clock
+  (t/zoned-date-time "2023-08-23T20:00-10:00[Pacific/Honolulu]") 
    (t/date)) 
  ; => returns (t/date "2023-08-23")
 ```
 
-### Extraction 
-
-for example, get the date part out of a zdt
+### Extraction / Conversion
 
 ```clojure
 (t/date (t/zoned-date-time))
+(t/hour (t/zoned-date-time))
+(t/inst (t/zoned-date-time))
 ```
 
 set hours and smaller to zero
@@ -60,6 +62,9 @@ set hours and smaller to zero
 
 (-> (t/time "10:10")
     (t/on (t/date)))
+
+; 'set' or 'adjust' a specific field
+(t/with (t/date) (t/year 3030))
 ```
 
 ### from/to Strings 
@@ -120,7 +125,7 @@ round-trip to/from epoch millis
 ## Arithmetic
 
 ```clojure
-(t/+ (t/of-minutes 5) (t/of-minutes 5) (t/of-minutes 5))
+(t/+ (t/of-minutes 5) (t/of-minutes 5) (t/of-minutes 5), ...)
 (t/- ...)
 ```
 
@@ -140,16 +145,17 @@ t/<, t/<=, t/=, ...
 t/max, t/max-by, t/min, t/min-by
 ```
 
-## contains
+## contains/coincidence
 
 ```clojure 
-(t/coincident? {:tick/beginning x :tick/end y} z )
+(t/coincident? temporal-start temporal-end a-temporal))
 ```
 
 # Type Predicates 
 
 ```clojure
 (t/date-time? x)
+(t/...? x)
 ```
 
 # Units
@@ -159,6 +165,9 @@ t/APRIL,
 t/DECEMBER ...
 
 t/FRIDAY, t/MONDAY...
+
+(keys t/unit-map) => :nanos :days :seconds ...
+
 ```
 
 
diff --git a/src/tick/core.cljc b/src/tick/core.cljc
index 736f589..a16915c 100644
--- a/src/tick/core.cljc
+++ b/src/tick/core.cljc
@@ -1074,8 +1074,8 @@
 (defn hence "current instant shifted forward by duration 'dur'" [dur]
   (p/forward-duration (now) dur))
 
-(defn midnight? [^Temporal t]
-  (cljc.java-time.duration/is-zero (cljc.java-time.duration/between t (beginning (p/date t)))))
+(defn midnight? [t]
+  (clojure.core/= cljc.java-time.local-time/midnight (p/time t)))
 
 ;; Predicates
 (defn clock?            "true if v is a clock?" [v] (cljc.java-time.extn.predicates/clock? v))
@@ -1391,24 +1391,17 @@
   (if (> x y) x y))
 
 (defn coincident?
-  "Does the span of time contain the given event? If the given event
-  is itself a span, then t must wholly contain the beginning and end
-  of the event."
-  [interval event]
-  (and
-    (<= (beginning interval) (beginning event))
-    (>= (end interval) (end event))))
-
-(comment
-  (require '[tick.core :as t])
-
-  (compare (t/instant "2020-02-05T00:00:00Z") (t/instant "2020-02-04T00:00:00Z"))
-
-  (let [(def event {:tick/beginning (t/instant "2020-02-02T00:00:00Z")
-                    :tick/end       (t/instant "2020-02-04T00:00:00Z")})]
-    (t/coincident? (t/instant "2020-02-03T00:00:00Z") interval))
-
-  )
+  "for the 2-arity ver, Does containing-interval wholly contain the given contained-interval?
+  
+  for the 3-arity, does the event lie within the span of time described by start and end"
+  ([containing-interval contained-interval]
+   (and
+     (<= (beginning containing-interval) (beginning contained-interval))
+     (>= (end containing-interval) (end contained-interval))))
+  ([start end event]
+   (and
+     (<= start event)
+     (>= end event))))
 
 (defn max
   "Find the latest of the given arguments. Callers should ensure that no
diff --git a/test/tick/api_test.cljc b/test/tick/api_test.cljc
index caf8ae5..6d83ff0 100644
--- a/test/tick/api_test.cljc
+++ b/test/tick/api_test.cljc
@@ -365,11 +365,15 @@
     (is (t/coincident? interval int-end))
     (is (t/coincident? interval interval))
     (is (not (t/coincident? interval (-> interval
-                                         (update :tick/end #(t/>> % (t/of-nanos 1)))))))
-    
-    
-    ))
-
+                                         (update :tick/end #(t/>> % (t/of-nanos 1))))))))
+  (testing "non-interval coincidence"
+    (doseq [[start-f new-amount] [[t/date t/of-days] [t/date-time t/of-hours]]]
+      (let [start (start-f)
+            end (t/>> start (new-amount 2))]
+        (is (t/coincident? start end (t/>> start (new-amount 1))))
+        (is (not (t/coincident? start end (t/<< start (new-amount 1)))))
+        (is (t/coincident? start end start))
+        (is (t/coincident? start end end))))))
 
 (deftest day-of-week
   (let [days (fn [strings] (map t/day-of-week strings))]