Rendering stale var

[andrus]

Just noticed this happenning out of the blue (it worked before on the same version of Jupyter and jjava). Consider the following code:

var df1 = Csv.load("../data/games.csv");
df1

1. I run the notebook cell in Jupyter once, it prints the contexts of the CSV
2. I change one cell in games.csv in a text editor, save
3. Rerun the cell above. It still displays the old data

The few ways to get it unstuck:

• restart the kernel
• make change in a copy of the file with a different name

[stariy95]

It was caused by the memory leak fix (#4), different snippets could share the same class and we didn't check for that.