change windows option to "only full" and "allow partial"

Author: michaelficarra

spec.emu

@@ -49,8 +49,8 @@ copyright: false
     1. If _windowSize_ is not an integral Number in the inclusive interval from *1*<sub>𝔽</sub> to 𝔽(2<sup>32</sup> - 1), then
       1. Let _error_ be ThrowCompletion(a newly created *RangeError* object).
       1. Return ? IteratorClose(_iterated_, _error_).
-    1. If _undersized_ is *undefined*, set _undersized_ to *"discard"*.
-    1. If _undersized_ is neither *"discard"* nor *"truncate"*, then
+    1. If _undersized_ is *undefined*, set _undersized_ to *"only full"*.
+    1. If _undersized_ is neither *"only full"* nor *"allow partial"*, then
       1. Let _error_ be ThrowCompletion(a newly created *TypeError* object).
       1. Return ? IteratorClose(_iterated_, _error_).
     1. Set _iterated_ to ? GetIteratorDirect(_O_).
@@ -59,7 +59,7 @@ copyright: false
       1. Repeat,
         1. Let _value_ be ? IteratorStepValue(_iterated_).
         1. If _value_ is ~done~, then
-          1. If _undersized_ is *"truncate"*, _buffer_ is not empty, and the number of elements in _buffer_ &lt; ℝ(_windowSize_), then
+          1. If _undersized_ is *"allow partial"*, _buffer_ is not empty, and the number of elements in _buffer_ &lt; ℝ(_windowSize_), then
             1. Perform Completion(Yield(CreateArrayFromList(_buffer_))).
           1. Return ReturnCompletion(*undefined*).
         1. If the number of elements in _buffer_ is ℝ(_windowSize_), then