Following TC's suggestion, I've done a test.

With this map file layer:

    LAYER
        NAME                            "road"
        STATUS                        DEFAULT
        TYPE                            LINE
        UNITS                            METERS
        CONNECTIONTYPE        POSTGIS
        CONNECTION                "host=localhost dbname=ttt user=uuu
password=xxx"
        DATA                            "geom FROM view_road_ar USING UNIQUE
oid USING SRID=4326"

        LABELITEM                    "name"

        CLASS
            STYLE
                WIDTH                    16
                COLOR                    0 0 0
                ANTIALIAS            TRUE
            END
            STYLE
                WIDTH                    15.8
                COLOR                    255 200 64
                ANTIALIAS            TRUE
            END
            LABEL
                ANGLE                    FOLLOW
                ENCODING            "UTF-8"
                COLOR                    0 0 0
                OUTLINECOLOR    255 255 255
                TYPE                    TRUETYPE
                FONT                    arial
                SIZE                    24
                ANTIALIAS            TRUE
                POSITION            AUTO
                PARTIALS            FALSE
                BUFFER                50
            END
        END
    END

With nothing changed, only change the ANGLE to AUTO and FOLLOW, the
generated images confirms the different processs of ANGLE AUTO & FOLLOW.
Then I've done one more test which uses ANGLE FOLLOW, but with OUTLINECOLOR
removed, then generated image shows "fractured" words.

<<attachment: angle_auto.jpg>>

<<attachment: angle_follow.jpg>>

<<attachment: no_outline.jpg>>

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