protecting access to object instance fields?

When I have an object (e.g. blessed hash) in the stash, I'd like to prevent
TT from accessing any of the hash fields directly. It can still access the
method functions.

A simple example - suppose the TT template looks like:

  [% obj.the_time %]
  [% obj._unix_time %]

and in the stash 'obj' is a blessed hash:

package foo;

sub new { bless { _unix_time => time }, shift }
sub the_time { ... }

I'd like the first GET to succeed and the second one to either fail, raise
and exception, return the empty string or something like that.

Is this possible?

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