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TL;DR: it depends entirely on the DHCP server software.
Generally the safe/reliable policy is to assign a smaller DHCP range (or ranges) and allocate static assignments outside of the DHCP range(s).
Assume your network is 192.168.1.0/24.
Specify 192.168.1.128/25 for DHCP, which means all DHCP addresses will be above 192.168.1.128.
This leaves you everything below 192.168.1.127 for static assignments.
Appreciate the example! It's when handling a DHCP range and the related CIDR notation that I tend to get especially muddled in this area. It certainly doesn't help that each router's interface and terminology tends to vary just enough to add uncertainty.
Regardless, the comments here and more focus on this have helped clear some of this up for me.
I still double-check my CIDR's/netmasks and expected ranges with a tool (some online one or other). Easier to avoid silly mistakes or typo's