python/src/vector_of_kll.cpp (3 lines):
	- line 188: // TODO: allow subsets of sketches to be updated
	- line 274: // TODO: allow subsets of sketches
	- line 285: // TODO: allow subsets of sketches


hll/include/HllArray-internal.hpp (1 line):
	- line 677: // TODO: we should be able to improve efficiency here by reading multiple bytes at a time


theta/include/theta_update_sketch_base_impl.hpp (1 line):
	- line 234: // TODO: avoid this for empty or trivial payloads (arithmetic types)


common/include/common_defs.hpp (1 line):
	- line 59: // TODO: find a better place for them


hll/include/HllSketch-internal.hpp (1 line):
	- line 111: // TODO: need to allow starting from a full-sized sketch


req/include/req_compactor_impl.hpp (1 line):
	- line 247: // TODO: swap if other is larger?


count/include/count_min_impl.hpp (1 line):
	- line 89: * TODO: Change this when we use only power of 2 buckets.


sampling/include/var_opt_sketch.hpp (1 line):
	- line 278: // TODO: should probably rearrange a bit to minimize gaps once aligned


cpc/include/cpc_common.hpp (1 line):
	- line 35: // TODO: Redundant and deprecated. Will be removed in next major version release.


quantiles/include/quantiles_sketch_impl.hpp (1 line):
	- line 1044: // TODO: probably actually doing copies given Level&?


sampling/include/var_opt_union_impl.hpp (1 line):
	- line 641: // TODO: extend to handle reservoir sampling


sampling/include/var_opt_sketch_impl.hpp (1 line):
	- line 1327: // TODO: extend to handle reservoir sampling