Not P but Moby-Dick (7)

[Mike Jing]

The following excerpt is from Chapter 27:

What, perhaps, with other things, made Stubb such an easygoing, unfearing
man, so cheerily trudging off with the burden of life in a world full of
grave peddlers, all bowed to the ground with their packs; what helped to
bring about that almost impious good-humor of his; that thing must have
been his pipe.

Several of the previous translations interpreted "grave peddlers" as
"peddlers of graves", which I feel is wrong.  I think the word "grave" here
means "serious, not mirthful or jocular," is that correct?