[SalesForce] Using lightning:input with type=”number” and formatter=”currency”

This is the easiest trick. Multiply the value with 100 and then use MOD function to find the remainder upon diving 100.

Basically, if value is 10.00 then it should be 10.00*100 = 1000, So MOD(1000,100) will give you remainder 0

If value is 10.05 then it should be 10.05*100 = 1005, So MOD(1005,100) will give you remainder greater than 0

This works for me

<apex:outputText value="{0, number,$ ###,###,##0.00}" rendered="{!MOD(number_value__c*100, 100)>0 }">
    <apex:param value="{!number_value__c}" />
</apex:outputText>

<apex:outputText value="{0, number,$ ###,###,##0}" rendered="{!MOD(number_value__c*100, 100)=0}">
    <apex:param value="{!number_value__c}" />
</apex:outputText>

I have the same issue here. I talked with Salesforce support about that almost a year ago, but they haven't provided a proper solution for that using the lightning:input component yet.

Note a single user would require to create records in multiple currencies. But apparently, Salesforce Lightning product developers failed to analyse that requirement.

The lightning:input component should include a currencyCode attribute that receives a currency ISO code and renders the value with the proper currency sign. I'm still waiting for that capability.

The work around is to use ui:inputCurrency and set the format attribute (i.e. £#,###.00), but if you have a form built using only lightning namespace components, then that will require additional effort to make ui:inputCurrency look and feel the same. You can also build your own component as well, but I guess you shouldn't be reinventing the wheel.