Ah yes, I can see what you mean by the difference between the use of these causing issues between in-tree and out-of-tree plugins. This is particularly interesting in that it makes sense to allocate the chunk data buffers using the H5MM_ routines to be compliant with the standards of HDF5 library development, but causes issues with those plugins which use the raw memory routines. Conversely, if the chunk buffers were to be allocated using the raw routines, it would break compatibility with the in-tree filters. Thank you for bringing this to my attention; I believe I will need to think on this one, as there are a few different ways of approaching the problem, with some being more "correct" than others.
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