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    would have been a little simpler. But it would have make it harder
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    would have been a little simpler. But it would have make it harder
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    to detect unintended boxing, and might also have made it harder to
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    to detect unintended boxing, and might also have made it harder to
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    transition to an alternate environment or binding representation
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    transition to an alternate environment or binding representation
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    should we wish to do that.
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    should we wish to do that.
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    If immediate values were to be supported more widely it would
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    In case immediate values are to be supported more widely the GC is
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    probably be necessary to suspend the GC when boxing values in
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    suspended when when boxing values in `R_expand_binding_value`.
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    `R_expand_binding_value`.
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  - Serialization handles environment frames with standard pairlist
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  - Serialization handles environment frames with standard pairlist
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    code, so the code not checks for an immediate binding and boxes
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    code, so the code not checks for an immediate binding and boxes
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    the value if necessary. An alternative would be to update the
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    the value if necessary. An alternative would be to update the
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    serialization format to support immediate bindings. But given how
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    serialization format to support immediate bindings. But given how