String to integer conversion fails

Puppet Version:2018.1.5
Puppet Server Version:5.5.8
OS Name/Version: RHEl and Solaris

Desired Behavior: 

Convert "08" from a string to an integer successfully on puppet run.

Actual Behavior:

Fails to convert "08" from a string to an integer on a puppet run.

Some of our newly added code was failing on what seems to be a valid String -> Integer conversion.

A minimal case to reproduce:

This, which is essentially the same as one of the examples in the docs (https://puppet.com/docs/puppet/5.5/function.html#conversion-to-integer) works:

1. puppet apply -e 'notify { "message": message => Integer("010", 10) }' 
   Notice: Compiled catalog for denga02l.unix.anz in environment production in 0.05 seconds 
   Notice: 10 
   Notice: /Stage[main]/Main/Notify[message]/message: defined 'message' as 10 
   Notice: Applied catalog in 0.26 seconds

As you can see the "radix" argument to specify base 10 makes it it correctly interpret the string as a decimal number

1. puppet apply -e 'notify { "message": message => Integer("07", 10) }'
   Notice: Compiled catalog for pe-201817-master.puppetdebug.vlan in environment production in 0.11 seconds
   Notice: 7
   Notice: /Stage[main]/Main/Notify[message]/message: defined 'message' as 7
   Notice: Applied catalog in 0.30 seconds

But this fails:

1. puppet apply -e 'notify { "message": message => Integer("08", 10) }' 
   Error: Evaluation Error: Error while evaluating a Function Call, 'new' The string '08' cannot be converted to Integer (line: 1, column: 33) on node denga02l.unix.anz

Since the first example correctly interprets the string I suspect that there are two passes over it - one of which is trying to interpret the value as octal, and the second which is doing the actual conversion.

This happens on both RHEL and Solaris systems