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+# (( )) doesn't support decimals. Use bc or awk.
+
+Bash [arithmetic conditional evaluation can only be performed on integers](https://www.tldp.org/LDP/abs/html/comparison-ops.html). More detail: Bash has limited data types which [include integer](http://www.tldp.org/LDP/abs/html/declareref.html), but everything is effectively [untyped](http://www.tldp.org/LDP/abs/html/untyped.html).
+
+Suggested workarounds to this constraint use bc or awk, here are 
+[some examples](https://stackoverflow.com/questions/11237794/how-to-compare-two-decimal-numbers-in-bash-awk).
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