Do not overuse `copy_to_buffer`

[dachengx]

strax/strax/dtypes.py

Line 233 in b97cad2

def copy_to_buffer(

There are many cases where copy_to_buffer will be used, but not all of them the copy_to_buffer is necessary. It is not necessary in particular one case:

1. We do not need source after "copying".
2. The fields of buffer is a subset of source.

In this case, numpy.lib.recfunctions.drop_fields is a better choice. Because we can directly overwrite source without worrying. Using drop_fields can help us save memory usage because there will be only one copy of the array existing in memory.

from numpy.lib.recfunctions import drop_fields

An example of this case is https://github.com/XENONnT/straxen/blob/5bb4e0494d02424ffb0563f758c6ffb644dfe4d8/straxen/plugins/records/records.py#L170-L171.