[Cuis-dev] Removal of detectSum: ?

[Luciano Notarfrancesco]

I just noticed the method Collection>>detectSum: that does the same as
'sum: ... ifEmpty[0]'. Besides being redundant, the name feels weird, as I
expect the detect* family of messages to return an element of the
collection. Does it seem reasonable to remove it? The attached changeset
changes the two senders to call sum:ifEmpty: instead and removes it. There
don't seem to be other senders in packages, but I just checked the official
packages.

Cheers,
Luciano
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