https://github.com/rails/rails/commit/5a7513593f64e0ff7e4de1ee37bac5eeddfae270

There are a bunch of other implicit branches that adds
1.8.x specific code that still needs to be removed. Pull
requests for those cases are welcome.

Revert html_escape to do a single gsub again, but add the "n" flag (no
language, i.e. not multi-byte) to protect against XSS via invalid utf8
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

This commit also implements a faster version of #demodulize I was unable
to isolate with git add --patch.

Not a big fan of the name #deconstantize. It complements #demodulize
getting rid of the rightmost constant, hence the name, but it is
unrelated to the well-known #constantize. So unsure. Could not come
with anything better, please feel free to rename.

Added ActiveSupport::Inflector.safe_constantize and String#safe_constantize; refactored common constantize tests into ConstantizeTestCases

Changed the year of a date used in a test which fails when using 1.8.7 on a 32bit machine (ArgumentError: time out of range)

Several AP tests fail after this change.

This reverts commit aaf01cd5, reversing
changes made to 9cc18c52.

Removed Array#safe_join in AS core_ext and moved it to a view helper with the same same. This also changes how safe_join works, if items or the separator are not html_safe they are html_escape'd, a html_safe string is always returned.
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Applied the wrong version.

This reverts commit 98c0c5db.

Corrected the html_safe implementation for Array. Moved the html safe version of join to its own method (safe_join) as not to degrade the performance of join for unrelated html_safe use. [#6298 state:resolved]

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Makes String#mb_chars on Ruby 1.9 return an instance of ActiveSupport::Multibyte::Chars to work around 1.9's lack of Unicode case folding.

Refactors class methods from ActiveSupport::Multibyte::Chars into new Unicode module, adding other related functionality for consistency.

[#4594 state:resolved]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#4652 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

This reverts commit ade756fe.

This reverts commits af0d1a88 and 64d109e3.