stdlib-js
diff --git a/‎README.md
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diff --git a/‎docs/repl.txt
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@@ -136,6 +136,7 @@ The function accepts the following `options`:
     -   `none`: only allow casting between identical types.
     -   `equiv`: allow casting between identical and byte swapped types.
     -   `safe`: only allow "safe" casts.
+    -   `mostly-safe`: allow "safe" casts and, for floating-point data types, downcasts.
     -   `same-kind`: allow "safe" casts and casts within the same kind (e.g., between signed integers or between floats).
     -   `unsafe`: allow casting between all types (including between integers and floats).
 
@@ -261,7 +262,7 @@ var str = arr.toString();
 
 // Serialize the array as JSON:
 str = JSON.stringify( arr.toJSON() );
-// returns '{"type":"ndarray","dtype":"float32","flags":{},"order":"row-major","shape":[3,3,3,3],"strides":[27,9,3,1],"data":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}'
+// e.g., returns '{"type":"ndarray","dtype":"float32","flags":{},"order":"row-major","shape":[3,3,3,3],"strides":[27,9,3,1],"data":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}'
 ```
 
 </section>
 
@@ -81,6 +81,8 @@
         - 'none': only allow casting between identical types.
         - 'equiv': allow casting between identical and byte swapped types.
         - 'safe': only allow "safe" casts.
+        - 'mostly-safe': allow "safe casts" and, for floating-point data types,
+          downcasts.
         - 'same-kind': allow "safe" casts and casts within the same kind (e.g.,
           between signed integers or between floats).
         - 'unsafe': allow casting between all types (including between integers