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`Tcl_(Get|Set)DefaultEncodingDir()`,
`Tcl_UniCharN(case)cmp()`,
`Tcl_UniCharCaseMatch()`
# New Features
## New commands
- `array default` — Specify default values for arrays (note that this alters the behaviour of `append`, `incr`, `lappend`).
- `array for` — Cheap iteration over an array's contents.
- `chan isbinary` — Test if a channel is configured to work with binary data.
- `coroinject`, `coroprobe` — Interact with paused coroutines.
- `clock add weekdays` — Clock arithmetic with week days.
- `const`, `info const*` — Commands for defining constants (variables that can't be modified).
- `dict getwithdefault` — Define a fallback value to use when `dict get` would otherwise fail.
- `file home` — Get the user home directory.
- `file tempdir` — Create a temporary directory.
- `file tildeexpand` — Expand a file path containing a `~`.
- `info commandtype` — Introspection for the kinds of commands.
- `ledit` — Equivalent to `lreplace` but on a list in a variable.
- `lpop` — Remove an item from a list in a variable.
- `lremove` — Remove a sublist from a list in a variable.
- `lseq` — Generate a list of numbers in a sequence.
- `package files` — Describe the contents of a package.
- `string insert` — Insert a string as a substring of another string.
- `string is dict` — Test whether a string is a dictionary.
- `tcl::process` — Commands for working with subprocesses.
- `*::build-info` — Obtain information about the build of Tcl.
- `readFile`, `writeFile`, `foreachLine` — Simple procedures for basic working with files.
- `tcl::idna::*` — Commands for working with encoded DNS names.
- `array default` — Specify default values for arrays (note that this alters the behaviour of `append`, `incr`, `lappend`).
- `array for` — Cheap iteration over an array's contents.
- `chan isbinary` — Test if a channel is configured to work with binary data.
- `coroinject`, `coroprobe` — Interact with paused coroutines.
- `clock add weekdays` — Clock arithmetic with week days.
- `const`, `info const*` — Commands for defining constants (variables that can't be modified).
- `dict getwithdefault` — Define a fallback value to use when `dict get` would otherwise fail.
- `file home` — Get the user home directory.
- `file tempdir` — Create a temporary directory.
- `file tildeexpand` — Expand a file path containing a `~`.
- `info commandtype` — Introspection for the kinds of commands.
- `ledit` — Equivalent to `lreplace` but on a list in a variable.
- `lpop` — Remove an item from a list in a variable.
- `lremove` — Remove a sublist from a list in a variable.
- `lseq` — Generate a list of numbers in a sequence.
- `package files` — Describe the contents of a package.
- `string insert` — Insert a string as a substring of another string.
- `string is dict` — Test whether a string is a dictionary.
- `tcl::process` — Commands for working with subprocesses.
- `*::build-info` — Obtain information about the build of Tcl.
- `readFile`, `writeFile`, `foreachLine` — Simple procedures for basic working with files.
- `tcl::idna::*` — Commands for working with encoded DNS names.
## New command options
- `chan configure ... -inputmode ...` — Support for raw terminal input and reading passwords.
- `chan configure ... -inputmode ...` — Support for raw terminal input and reading passwords.
- `clock scan ... -validate ...`
- `info loaded ... ?prefix?`
- `lsearch ... -stride ...` — Search a list by groups of items.
- `regsub ... -command ...` — Generate the replacement for a regular expression by calling a command.
- `lsearch ... -stride ...` — Search a list by groups of items.
- `regsub ... -command ...` — Generate the replacement for a regular expression by calling a command.
- `socket ... -nodelay ... -keepalive ...`
- `vwait` controlled by several new options
- `expr` string comparators `lt`, `gt`, `le`, `ge`
- `expr` supports comments inside expressions
## Numbers
- <code>0<i>NNN</i></code> format is no longer octal interpretation. Use <code>0o<i>NNN</i></code>.
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