<p>Just to confirm that it's probably not a garbageCollect problem, I could not reproduce in latest Squeak trunk. I did not use Zinc because it's too much difficult to install in Squeak and just replaced with WebClient. STON is available (installed thru Squit/Squot git support):</p>
<pre><code>| aJson anArray |
aJson := WebClient httpGet: 'https://data.nasa.gov/resource/y77d-th95.json'.
Array streamContents: [ :aStream |
        400 timesRepeat: [ 
                aStream nextPutAll: (STON fromString: aJson content).
                Smalltalk saveSession ] ].
</code></pre>
<p>The resulting image file is 540Mbytes long.</p>

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