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* i.e. separate namespaces and headers for _Tape_ and _State_ functions
* `void` is now used as the `BLANK` field value
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* `ListIndex` already implements the necessary partial template specializations for finding elements matching a predicate
* reimplemented `Cond` using `detail::find_variadic` as `Find` depends on `Apply` which in turn depends on `Cond`
** it is useful if core functionality such as the branched conditional `Cond` do not require higher order functionality such as `Find`
*** otherwise one can not use core functionality in the implementation of higher order functionality
* introduced `utility::predicate_guard` helper template
** checks a given value using a predicate and only forwards the value to the guarded function if this check is successful
** if check is unsuccessful it returns a surrogate value simmilar to `utility::predicate_assurance`
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* while class templates enable e.g. hiding implementation details they also require evaluation via `Eval`
** this clutters up the actual logic and is now hidden behind aliae that perform the evaluation
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* replaces `typename *::type` constructs with `Eval` applications
* aims to further unify function evaluation
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* all other functions sans `Cons` are resolved when the respective member `*::type` is instantiated
* this was changed soely to increase coherence
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* added appropriate test case
* other queries in `query.h` may be redefined in terms of `Find`
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