Handling of upper/lowercase in package names (PR#2816)

Hi,

This is (presumably?) a bug in R 1.7.0 under Windows. I have not tested it
on other systems. Attachment of packages is case sensitive but not
library(), resulting in multiple loadings of the same package if the library
name is spelled differently. The following example loads the `tools'
package, once as `tools' and once as `Tools'. This behavior is the same with
all packages and it occurs also in R 1.6.2.

library(tools)
search()

 [1] ".GlobalEnv"      "package:tools"   "package:methods" "package:ctest"
"package:mva"
 [6] "package:modreg"  "package:nls"     "package:ts"      "Autoloads"
"package:base"

library(Tools)

Attaching package 'Tools':


        The following object(s) are masked from package:tools :

         .checkDemoIndex .checkVignetteIndex .installMD5sums
.installPackageDescription .installPackageIndices buildVignettes
checkAssignFuns checkDocArgs checkDocStyle checkFF checkMD5sums checkMethods
checkTnF checkVignettes codoc md5sum pkgVignettes print.checkAssignFuns
print.checkDemoIndex print.checkDocArgs print.checkDocStyle print.checkFF
print.checkMethods print.checkTnF print.checkVignetteIndex
print.checkVignettes print.codoc print.undoc Rdindex Rtangle RtangleSetup
RtangleWritedoc RweaveLatex RweaveLatexOptions RweaveLatexSetup Stangle
Sweave SweaveSyntaxLatex SweaveSyntaxNoweb SweaveSyntConv undoc

search()

 [1] ".GlobalEnv"      "package:Tools"   "package:tools"   "package:methods"
"package:ctest"
 [6] "package:mva"     "package:modreg"  "package:nls"     "package:ts"
"Autoloads"
[11] "package:base"


Version:
 platform = i386-pc-mingw32
 arch = i386
 os = mingw32
 system = i386, mingw32
 status =
 major = 1
 minor = 7.0
 year = 2003
 month = 04
 day = 16
 language = R

Windows XP Professional (build 2600) Service Pack 0.0

Search Path:
 .GlobalEnv, package:Tools, package:tools, package:methods, package:ctest,
package:mva, package:modreg, package:nls, package:ts, Autoloads,
package:base

Best,

Philippe Grosjean

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