I also find this confusing:
(eq 1 1)
t
(eq 1.0 1.0)
nil
At present, each integer value has a unique Lisp object in Emacs
Lisp. Therefore, `eq' is equivalent to `=' where integers are
concerned. It is sometimes convenient to use `eq' for comparing an
unknown value with an integer, because `eq' does not report an error if
the unknown value is not a number--it accepts arguments of any type.
By contrast, `=' signals an error if the arguments are not numbers or
markers. However, it is a good idea to use `=' if you can, even for
comparing integers, just in case we change the representation of
integers in a future Emacs version.
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