I propose the following small improvement.
diff --git a/lisp/bbdb.el b/lisp/bbdb.el
index 36b3f913..ccd77a84 100644
--- a/lisp/bbdb.el
+++ b/lisp/bbdb.el
@@ -1032,8 +1032,8 @@ (defcustom bbdb-message-pop-up nil
(defcustom bbdb-pop-up-window-size 0.5
"Vertical size of a MUA pop-up BBDB window (vertical split).
If it is an integer number, it is the number of lines used by BBDB.
-If it is a fraction between 0 and 1, it is the fraction of the tallest existing
-window that BBDB will take over."
+If it is a fraction between 0 and 1.0 (inclusive), it is the fraction
+of the tallest existing window that BBDB will take over."
:group 'bbdb-mua
:type 'number)
@@ -2578,7 +2578,7 @@ (defun bbdb-pop-up-buffer (&optional select horiz-p)
(if (> (window-height window) (window-height tallest-window))
(setq tallest-window window)))
(select-window tallest-window) ; select it and split it...
- (if (= bbdb-pop-up-window-size 1)
+ (if (eql bbdb-pop-up-window-size 1.0)
;; select `bbdb-buffer-name'
(switch-to-buffer (get-buffer-create bbdb-buffer-name))
(condition-case nil ; `split-window' might fail
------------------------------------------------------------------------------
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