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-rw-r--r--tex/context/base/l-boolean.lua4
1 files changed, 2 insertions, 2 deletions
diff --git a/tex/context/base/l-boolean.lua b/tex/context/base/l-boolean.lua
index be7ec7d57..cf8dc0ac8 100644
--- a/tex/context/base/l-boolean.lua
+++ b/tex/context/base/l-boolean.lua
@@ -35,7 +35,7 @@ function toboolean(str,tolerant)
end
end
-function string.is_boolean(str)
+function string.is_boolean(str,default)
if type(str) == "string" then
if str == "true" or str == "yes" or str == "on" or str == "t" then
return true
@@ -43,7 +43,7 @@ function string.is_boolean(str)
return false
end
end
- return nil
+ return default
end
function boolean.alwaystrue()