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(Alan Ruttenberg) Like typecase except the check is whether the form is an instance of one of the classes, which are lookup up using find-java-class. Also included: a minor fix to print-java-object-by-class - it was getting an error while printing a null pointer. The printer now prints null references as "#<null>". Merges <https://github.com/armedbear/abcl/pull/73>
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