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+ FEAT(solution+jsonp)): can extend in place pandas (dataframes & series) horizontally/vertically
with :term:`pandas concatenation`.
Usefull for when working with :ref:`Pandas advanced indexing <pandas:advanced.hierarchical>`.
or else, sideffecteds are needed to break read-update cycles on dataframes.
+ fix(jsonp): :func:`.set_path_value()` should have failed to modify object attributes
(but not mass-updated, utilized by :term:`accessor`\s).
+ FEAT/fix(solution): :term:`overwrite`\s work properly for non-:term:`layer`\ed solutions.
+ refact: dropped ``_layers`` solution-attribute, role passed to (existing) ``executed``.
+ FEAT(execution): support also *post*\-:term:`callbacks`.
+ FEAT/DROP(modifier): added x3 new modifiers, :func:`.vcat` and :func:`.hcat`,
(and respective accessors), :func:`.implicit` -- dropped never-used ``accessor`` modifier.
+ FEAT: parse string explicitly passed in ``jsonp=...`` argument in modifiers.
+ feat(modifier+fnop): keep just the last part of a keyword+jsonp dependency,
to save an explicit conversion (jsonps are invalid as python-identifiers).
+ break(modifier+fnop): forbid :term:`implicit` term:`sfxed` -- hard to find a solid use-case,
pure `sfx` would be preferable in that case.
+ fix: forbid :term:`aliasing <alias>` implicits -- they wouldn't work anyway.
+ enh(compose): check for node type collisions (i.e. a dependency name clashing
with some operation name).