[texhax] xcolor package puzzle

[Peter Flynn]

On 09/10/18 11:21, David Carlisle wrote:
>> How does the latter avoid being ambiguous as to which package it applies?
> 
> It is a general latex feature that documentclass options are "global
> options" that are passed to every package (but silently ignored by
> packages that do not declare that option)

Do you recall when that became the behaviour (version)?
Was it in LeTeX 2e from the start?
And are there packages which will gag on it?

///Peter