[Groff] Number registers

[andlabs]

Hello. I'm working with code that amends to ms' PP. The code uses a number
register 1t - that is the number 1 followed by lowercase t. First, is such
an identifier legal in groff? Second, what happens if a register is not
defined with .nr and used with \n(xx - would it be 0 or would it be an
error?
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