Tweak wording for trapping in builtins

Author: eqrion

Diff for: document/js-api/index.bs

@@ -1803,15 +1803,15 @@ To <dfn>validate an import for builtins</dfn> with |import|, enabled builtins |b
 
 <h3 id="builtins-js-string">String Builtins</h3>
 
-String builtins adapt the interface of the String builtin object. The import name for this set is `wasm:js-string`.
+String builtins adapt the interface of the [=String=] builtin object. The import name for this set is `wasm:js-string`.
 
 <h4 id="builtins-js-string-abstract-ops">Abstract operations</h4>
 <div algorithm>
 
 The <dfn abstract-op lt="UnwrapString">UnwrapString(|v|)</dfn> abstract operation, when invoked, performs the following steps:
 
 1. If [=Type=](|v|) is not [=String=]
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Return |v|
 
 </div>
@@ -1868,10 +1868,10 @@ Note: This function only takes a mutable i16 array defined in its own recursion
 When this builtin is invoked with parameters |array|, |start|, and |end|, the following steps must be run:
 
 1. If |array| is null
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Let |length| be the number of elements in |array|.
 1. If |start| > |end| or |end| > |length|
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Let |result| be the empty string.
 1. Let |i| be |start|.
 1. While |i| < |end|:
@@ -1893,12 +1893,12 @@ Note: This function only takes a mutable i16 array defined in its own recursion
 When this builtin is invoked with parameters |string|, |array|, and |start|, the following steps must be run:
 
 1. If |array| is null
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Let |string| be [=?=] [$UnwrapString$](|string|).
 1. Let |stringLength| be the [=string/length=] of |string|.
 1. Let |arrayLength| be the number of elements in |array|.
 1. If |start| + |stringLength| > |arrayLength|
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Let |i| be 0.
 1. While |i| < |stringLength|:
     1. Let |charCode| be [$CharCodeAt$](|string|, |i|).
@@ -1928,7 +1928,7 @@ The |funcType| of this builtin is `(func (param i32) (result externref))`.
 When this builtin is invoked with parameter |v|, the following steps must be run:
 
 1. If |v| &gt; 0x10ffff
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Return [=!=] [$Call$]([=String.fromCodePoint=], undefined, « [=ToJSValue=](|v|) »).
 
 </div>
@@ -1943,7 +1943,7 @@ When this builtin is invoked with parameters |string| and |index|, the following
 1. Let |string| be [=?=] [$UnwrapString$](|string|).
 1. Let |length| be the [=string/length=] of |string|.
 1. If |index| >= |length|
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Return [$CharCodeAt$](|string|, |index|).
 
 </div>
@@ -1958,7 +1958,7 @@ When this builtin is invoked with parameters |string| and |index|, the following
 1. Let |string| be [=?=] [$UnwrapString$](|string|).
 1. Let |length| be the [=string/length=] of |string|.
 1. If |index| >= |length|
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. Return [=!=] [$Call$]([=String.prototype.codePointAt=], |string|, « [=ToJSValue=](|index|) »).
 
 </div>
@@ -2014,9 +2014,9 @@ Note: Explicitly allow null strings to be compared for equality as that is meani
 When this builtin is invoked with parameters |first| and |second|, the following steps must be run:
 
 1. If |first| is not null and [=Type=](|first|) is not [=String=]
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. If |second| is not null and [=Type=](|second|) is not [=String=]
-    1. Throw a {{RuntimeError}} exception. TODO: this needs to not be catchable, like a trap.
+    1. Throw a {{RuntimeError}} exception as if a [=trap=] was executed.
 1. If [=!=] [=IsStrictlyEqual=](|first|, |second|) is true
     1. Return 1.
 1. Return 0.