Simplify "strict mode" section in order to avoid too much noise

These comments can be found in the bash-boilerplate project and aren't
necessary here. Since the $DEFAULT_IFS doesn't appear to be used,
either, the $IFS setting can be reduced to a since simple assignment.

hosts

@@ -27,103 +27,10 @@
 # Strict Mode
 ###############################################################################
 
-# Treat unset variables and parameters other than the special parameters ‘@’ or
-# ‘*’ as an error when performing parameter expansion. An 'unbound variable'
-# error message will be written to the standard error, and a non-interactive
-# shell will exit.
-#
-# This requires using parameter expansion to test for unset variables.
-#
-# http://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion
-#
-# The two approaches that are probably the most appropriate are:
-#
-# ${parameter:-word}
-#   If parameter is unset or null, the expansion of word is substituted.
-#   Otherwise, the value of parameter is substituted. In other words, "word"
-#   acts as a default value when the value of "$parameter" is blank. If "word"
-#   is not present, then the default is blank (essentially an empty string).
-#
-# ${parameter:?word}
-#   If parameter is null or unset, the expansion of word (or a message to that
-#   effect if word is not present) is written to the standard error and the
-#   shell, if it is not interactive, exits. Otherwise, the value of parameter
-#   is substituted.
-#
-# Examples
-# ========
-#
-# Arrays:
-#
-#   ${some_array[@]:-}              # blank default value
-#   ${some_array[*]:-}              # blank default value
-#   ${some_array[0]:-}              # blank default value
-#   ${some_array[0]:-default_value} # default value: the string 'default_value'
-#
-# Positional variables:
-#
-#   ${1:-alternative} # default value: the string 'alternative'
-#   ${2:-}            # blank default value
-#
-# With an error message:
-#
-#   ${1:?'error message'}  # exit with 'error message' if variable is unbound
-#
-# Short form: set -u
 set -o nounset
-
-# Exit immediately if a pipeline returns non-zero.
-#
-# NOTE: this has issues. When using read -rd '' with a heredoc, the exit
-# status is non-zero, even though there isn't an error, and this setting
-# then causes the script to exit. read -rd '' is synonymous to read -d $'\0',
-# which means read until it finds a NUL byte, but it reaches the EOF (end of
-# heredoc) without finding one and exits with a 1 status. Therefore, when
-# reading from heredocs with set -e, there are three potential solutions:
-#
-# Solution 1. set +e / set -e again:
-#
-# set +e
-# read -rd '' variable <<EOF
-# EOF
-# set -e
-#
-# Solution 2. <<EOF || true:
-#
-# read -rd '' variable <<EOF || true
-# EOF
-#
-# Solution 3. Don't use set -e or set -o errexit at all.
-#
-# More information:
-#
-# https://www.mail-archive.com/bug-bash@gnu.org/msg12170.html
-#
-# Short form: set -e
 set -o errexit
-
-# Return value of a pipeline is the value of the last (rightmost) command to
-# exit with a non-zero status, or zero if all commands in the pipeline exit
-# successfully.
 set -o pipefail
-
-# Set IFS to just newline and tab at the start
-#
-# http://www.dwheeler.com/essays/filenames-in-shell.html
-#
-# $DEFAULT_IFS and $SAFER_IFS
-#
-# $DEFAULT_IFS contains the default $IFS value in case it's needed, such as
-# when expanding an array and you want to separate elements by spaces.
-# $SAFER_IFS contains the preferred settings for the program, and setting it
-# separately makes it easier to switch between the two if needed.
-#
-# NOTE: also printing $DEFAULT_IFS to /dev/null to avoid shellcheck warnings
-# about the variable being unused.
-DEFAULT_IFS="$IFS"; printf "%s" "$DEFAULT_IFS" > /dev/null
-SAFER_IFS="$(printf '\n\t')"
-# Then set $IFS
-IFS="$SAFER_IFS"
+IFS="$(printf '\n\t')"
 
 ###############################################################################
 # Globals