MSVC warnings in the new glz::to_chars implementation

The following code snippet: ```cpp #include <iostream> #include <glaze/util/zmij.hpp> int main() { char buff[10]{}; glz::to_chars(buff, 10.f); std::cout << buff << '\n'; return 0; } ``` compiled under VS2026 v.18.5.0 using glaze v7.5.0 produces the following litany of warning: ``` 1> main.cpp 1>glaze\util\zmij.hpp(446,41): error C2220: the following warning is treated as an error 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(446,41): warning C4244: 'return': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(527,40): warning C4244: '=': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(528,40): warning C4244: '=': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(533,41): warning C4244: '=': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(535,57): warning C4244: '=': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(537,47): warning C4244: '=': conversion from 'int' to 'unsigned char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(603,47): warning C4244: 'initializing': conversion from 'double' to 'const uint64_t', possible loss of data 1> (compiling source file 'main.cpp') 1> glaze\util\zmij.hpp(603,47): 1> the template instantiation context (the oldest one first) is 1> E:\Projects\paszklar\cpp_testing\cpp_testing\main.cpp(6,10): 1> see reference to function template instantiation 'char *glz::to_chars<float,false>(char *,T) noexcept' being compiled 1> with 1> [ 1> T=float 1> ] 1> glaze\util\zmij.hpp(1077,28): 1> see reference to function template instantiation 'char *glz::zmij::detail::write<float,false>(Float,char *) noexcept' being compiled 1> with 1> [ 1> Float=float 1> ] 1> glaze\util\zmij.hpp(948,27): 1> see reference to variable template 'const glz::zmij::detail_impl::constants<false> consts_v<0>' being compiled 1> glaze\util\zmij.hpp(635,55): 1> see reference to class template instantiation 'glz::zmij::detail_impl::constants<false>' being compiled 1>glaze\util\zmij.hpp(632,1): warning C4324: 'glz::zmij::detail_impl::constants<false>': structure was padded due to alignment specifier 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(974,28): warning C4018: '<': signed/unsigned mismatch 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(979,28): warning C4244: 'initializing': conversion from '__int64' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(986,37): warning C4018: '>=': signed/unsigned mismatch 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(1003,54): warning C4244: '=': conversion from 'int' to 'char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(1011,33): warning C4244: '=': conversion from 'int' to 'char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(1035,28): warning C4244: 'initializing': conversion from 'unsigned __int64' to 'uint32_t', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(1037,27): warning C4244: '=': conversion from 'uint32_t' to 'char', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(845,107): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1> glaze\util\zmij.hpp(845,107): 1> the template instantiation context (the oldest one first) is 1> glaze\util\zmij.hpp(1077,28): 1> see reference to function template instantiation 'char *glz::zmij::detail::write<float,false>(Float,char *) noexcept' being compiled 1> with 1> [ 1> Float=float 1> ] 1> glaze\util\zmij.hpp(971,32): 1> see reference to function template instantiation 'glz::zmij::detail_impl::to_decimal_result glz::zmij::detail_impl::to_decimal<float,unsigned int,false>(UInt,int64_t,bool,const glz::zmij::detail_impl::constants<false> &) noexcept' being compiled 1> with 1> [ 1> UInt=unsigned int 1> ] 1>glaze\util\zmij.hpp(844,22): warning C4244: 'initializing': conversion from 'unsigned __int64' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(850,17): warning C4456: declaration of 'dec_exp' hides previous local declaration 1> (compiling source file 'main.cpp') 1> glaze\util\zmij.hpp(844,14): 1> see declaration of 'dec_exp' 1>glaze\util\zmij.hpp(850,43): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(851,53): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(870,27): warning C4456: declaration of 'extra_shift' hides previous local declaration 1> (compiling source file 'main.cpp') 1> glaze\util\zmij.hpp(847,24): 1> see declaration of 'extra_shift' 1>glaze\util\zmij.hpp(871,53): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data 1> (compiling source file 'main.cpp') 1>glaze\util\zmij.hpp(892,55): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data 1> (compiling source file 'main.cpp') ``` This seems quite a regression, since from my experience so far the library compiled cleanly even with `/W4 /WX`.