# Allow opening any 'source'd file, even if not specified as input
external-sources=true

# Turn on warnings for unquoted variables with safe values
enable=quote-safe-variables

# Turn on warnings for unassigned uppercase variables
enable=check-unassigned-uppercase

# Enforces braces around variable expansions to avoid ambiguity or confusion.
# e.g. ${filename} rather than $filename
enable=require-variable-braces 

# Requires double-bracket syntax [[ expr ]] for safer, more consistent tests.
# NO:  if [ "$var" = "value" ]
# YES: if [[ $var == "value" ]]
enable=require-double-brackets