std.mergePatch loses hidden fields

[guoshimin]

% jsonnet -e 'local a = {a:: "foo"}; local b = std.mergePatch(a, {}); b.a'
RUNTIME ERROR: Field does not exist: a
    <cmdline>:1:57-59

[sparkprime]

This is because mergePatch is a JSON standard and the value is effectively manifested to JSON first. What are you trying to do?

[guoshimin]

Sorry for the late response. I can't recall what motivated this issue report. I guess it was just that this behavior didn't seem intuitive to me. I'll close it for now and reopen if I have a real use case.