The microtype package

IMPLEMENTATION: Font setup 64\MT@get@unit\MT@get@unit@\MT@set@inputenc\MT@cat\MT@set@inputenc@1304 \MT@exp@cs\ifx{MT@\MT@feat @unit@}\@empty1305 \let\MT@get@char@unit\MT@get@charwd1306 \else1307 \MT@exp@cs\ifx{MT@\MT@feat @unit@}\m@ne1308 \let\MT@get@space@unit\MT@get@font@dimen1309 \else1310 \MT@exp@cs\MT@get@unit{MT@\MT@feat @unit@}%1311 \fi1312 \fiPreset all characters? If so, we surely don’t need to reset, too.1313 \MT@ifdefined@n@T{MT@\MT@feat @c@\csname MT@\MT@feat @c@name\endcsname @preset}{%1314 \csname MT@preset@\MT@feat\endcsname1315 \MT@let@nc{MT@reset@\MT@feat @codes}\relax1316 }%1317 }If unit contains an em or ex, we use the corresponding \fontdimen to obtain thereal size. Simply converting the em into points might give a wrong result, sincethe font probably isn’t set up yet, so that these dimensions haven’t been updated,either.1318 \def\MT@get@unit#1{%1319 \expandafter\MT@get@unit@#1 e!\@nil1320 \ifx\x\@empty\else\let#1\x\fi1321 \@defaultunits\@tempdima#1 pt\relax\@nnil1322 \ifdim\@tempdima=\z@1323 \MT@warning@nl{%1324 Cannot set \@nameuse{MT@abbr@\MT@feat} factors relative to zero\MessageBreak1325 width. Setting factors of list `\@nameuse{MT@\MT@feat @c@name}’\MessageBreak1326 relative to character widths instead}%1327 \let#1\@empty1328 \let\MT@get@char@unit\MT@get@charwd1329 \else1330 \MT@vinfo{... : Setting \@nameuse{MT@abbr@\MT@feat} factors relative1331 to \the\@tempdima}%1332 \MT@count=\@tempdima\relax1333 \fi1334 }1335 \def\MT@get@unit@#1e#2#3\@nil{%1336 \ifx\\#3\\\let\x\@empty \else1337 \if m#2%1338 \edef\x{#1\fontdimen6\MT@font}%1339 \else1340 \if x#2%1341 \edef\x{#1\fontdimen5\MT@font}%1342 \fi1343 \fi1344 \fi1345 }The configurations may be under the regime of an input encoding.1346 \def\MT@set@inputenc#1{%We remember the current category (c or inh), in case of warnings later.1347 \def\MT@cat{#1}%1348 \edef\@tempa{MT@\MT@feat @#1@\csname MT@\MT@feat @#1@name\endcsname @inputenc}%1349 \MT@ifdefined@n@T\@tempa\MT@set@inputenc@1350 }More recent versions of inputenc remember the current encoding, so that we cantest whether we really have to load the encoding file.1351 \MT@addto@setup{%1352 \@ifpackageloaded{inputenc}{%